Here's Bostrom's letter about it (along with the email) for context: https://nickbostrom.com/oldemail.pdf
Maybe a typo: the second AI (EA) should be AI (Work)?
AI (EA) did not have to care about mundane problems such as “availability of relevant training data” or even “algorithms”: the only limit ever discussed was amount of computation, and that’s why AI (EA) was not there yet, but soon would be, when systems would have enough computational power to simulate human brains.
Btw, really like your writing style! :)
I'm sorry, but I consider myself EA-adjacent-adjacent.