He has been working on tinygrad since atleast 2021.
https://geohot.github.io/blog/jekyll/update/2021/06/13/a-bre...
I know it seems like ages ago at the current pace, but ya gotta remember that GPT-3 was released in mid-2020.
But not to everyone.
I would argue that it was not until around December 2022 that the world at large got the opportunity to begin really using AI directly. With ChatGPT.