From his website stallman.org:
Richard Stallman has cancer. Fortunately it is slow-growing and manageable follicular lymphona, so he will probably live many more years nonetheless. But he now has to be even more careful not to catch Covid-19.
Recent video of him speaking at GNU 40 Hacker Meeting. Screenshots of video stream.
I think we still have a long way to go before this is equivalent to "the preferred form for modification". I'd give it at least 5 more years. It would be really cool if you could just say "Hello AI, please remove all ad code from Windows". But I think it is going to be a long time until we get there.
Also as this gets closer companies will get more defensive. It will become an arms race of obfuscating the code vs the AI understanding it.
And still, free software that can be modified and the copies can be redistributed is a world away from being able to ask your AI to try and make these modifications yourself.
On top of all of that don't forget about DMCA where circumventing digital protections is a crime, even if you don't commit any other crime.