1) Diagrams 1 and 2 are found commonly in the Book of Breathings, which were papyri common to 2nd and 3rd century BCE (not Abraham's time of 4-5k BCE).
2) It's a 300-200 BCE papyri, we now that not just by the diagrams exactly matching others now commonly had in museums, but by the papyri itself. Fragments of the "Joseph Papyri" (as they were catalogued in Chicago, Emma having sold them to those curators) survived the Chicago Fire and were given to the St Louis Museum, which gave them to the Smithsonian, which gave them (1960s) to the LDS church. The Church History office was so convinced (as believing Mormons are and I used to be) that they were of ancient origin, and seeing this as a "proving" moment, that they had them examined. The results were as mentioned, circa 300-200 BCE and common diagrams found in other "Book of Breathings" (mummies were buried w/the papyri as a guide and instructions for the after life).
3) JS' translation of Diagrams 1 and 2 do not match modern Egyptologist's translations/consensus. Egyptologists today can walk into a tomb and read the hieroglyphs. The Rosetta Stone was the beginning of modern interpretation, as it had ancient Egyptian, ancient Greek and Demotic on it announcing the same thing. And more than 150 years of research later, modern Egyptologists know the ancient language. Are we to believe thousands of scholars around the world and living proof (the Rosetta Stone, etc.), or Joseph Smith, regarding the Diagrams?
At least with the BOM Joseph could claim the golden plates full of characters from a reformed language, were taken by an angel back to heaven -- so there's no way to prove or disprove such not-so-distant (400 AD) language. Although, Joseph did write a "Caractors" document, which was taken by Martin Harris to an Egyptologist of the time, Professor Anton, who declared them inauthentic. Mormons have perpetuated a myth that he tore up his certificate of authenticity when he found out they were from gold plates given to Joseph from an angel, but in fact Professor Anton is on record after that event, writing that such an assertion was false, that he had in fact said those characters were not ancient. Nonetheless, there is a contemporary replica of the "Caractors" document owned by the Community of Christ, who until 1980 wanted to prove the BOM was true; they gave copies (you can find it in a quick google search) to the LDS church and others -- and all Egyptologists agree, they are non-sensical, non-Egyptian-based caractors. https://www.researchgate.net/figure/Book-of-Mormon-Caractors-copied-by-John-Whitmer-C-Community-of-Christ_fig1_288345443
The LDS church acknowledges the three items above in its Gospel Topics Essay, and offers the apologist view that Joseph used the papyri (which he'd obtained with the mummies) to channel a more ancient time and what Abraham would have wrote. Okay, that's interesting and I'm better with that version (but it's not openly taught, and they had to change the story to "he channeled Abraham, as the Diagrams and surviving Joseph Scrolls are disproven as ancient).
For reference, the oldest Torah scrolls only date to the First Temple period, 1.5-2k years later -- so Joseph's claim that the papyri were Abraham's writing -- would be absolutely incredible and wanted by Jews, Christians and Muslims -- who all claim Abraham.
4) JS also produced the GAEL alphabet, a means to translate ancient Egyptian to modern English. It is completely off to what modern Egyptologists know.
5) JS studied ancient Hebrew while in middle and late Kirtland years -- and while I'm sure JS was an intellectual giant, he made claims of ancient origin that weren't true, and his Hebrew wasn't the best (credit the man, he only learned for a couple years -- yet he was a seer?) eg The Hebrew word for "dog" is "כלב", which is pronounced "Keleb".Sirius, the brightest star in the sky, is officially known as "Alpha Canis Majoris," and informally known as "The Dog Star". i.e. "Kolob" was a bastardized word for "dog", and Kolob is Sirius.
Again w/scripture, BoA is like the BOM - not of ancient origin -- but what is scripture? does it have to be historical? Is what it teaches negated by a false, modern claim of ancient authenticity? I think the value of scripture is simply in the meaning of the stories.
The translation is a fraud, willingly committed by a man who knowingly deceived his followers. It has been documented as fraudulent by experts in and out of the church. This alone is enough to cast sufficient doubt on any of Joseph Smith’s claims.
The Book of Abraham was NOT a translation by Joseph Smith, but rather completely fabricated. The papyri he claimed to use have nothing to do with Abraham or anything else written about in that book. I remember that even as a teenager who knew little more about Egypt than what she had learned in elementary school, I knew that the items under the table in Facsimile 1 were clearly canopic jars, not idols.
This was what finally did any hopes of a testimony in. The gospel topic essays are clear in saying the papyrus is actually about a funeral, and not at all about Abraham. I can’t support that being true.