Most probably the author knows this but there are some photos and information here [1]. His grandfather is a member of "The Righteous Among the Nations" [2].
[1] https://www.yadvashem.org/righteous/stories/sietsma.html
[1] https://www.yadvashem.org/righteous/stories/sietsma.html
One example is a GPT version [1] fine tuned on texts of Sefaria [2].
The initiator was in direct contact with Sam Altman to kickstart it. (Personal communication).
He talks about this publicly [3]
[1]: https://github.com/Sefaria/AppliedAI [2]: https://www.sefaria.org/texts [3]: https://m.youtube.com/watch?v=tZkJl2fk0rc