If model training is determined to be fair use under US copyright law—either legislated by Congress or interpreted by Federal courts—then no license text can remove the right to use source code that way.

You can follow him on https://stallman.org/ What is he doing? I believe still giving talks and taking stance on current day political issues. Additionally I believe the last few years where quite turbulent so I assume he is taking life at his own pace.

RMS is probably greatly behind the technical news at this point. I mean, he's surfing the web via a email summary of some websites. Even if he doesn't condone of how the internet is evolving, he can't really keep up with technology if he doesn't "mingle".

He's also 72, we can't expect him to save everyone. We need new generations of FOSS tech leaders.