@vavakado Sophia, one of the people who resigned over it, put it in no uncertain terms that racism is one of the reasons: https://www.sophiajt.com/why-i-left-rust/
The summary by Amos is very centrist, but it provides a good overview into all the statements made (you can notice how toothless they are, but at least they are corporately apologetic): https://fasterthanli.me/articles/the-rustconf-keynote-fiasco-explained
Then, dtolnay wrote his own perspective, 3 months after the fact, in which he gave a non-apology and suggested that ThePhdDev wanted to do the talk much later and was "pressured" into doing it early. This is utter bullshit, ThePhdDev had regular nervousness and was encouraged many times, he wanted to give that talk.
ThePhdDev rightfully exploded on Fedi for this fucker, being one of the most vocal enemies of that talk, saying this gross lie and half-assing a non-apology. You'll have to forgive me; I don't have a link to it handy. I hope it should still be available.