It depends on what you're trying to do...

If you'd like to dox someone on Nostr with AI, it'll be pretty simple...you won't get their nsec, but you'll be able to identify any given person.

There's enough personal information in posts to adequately dox any of us (i.e. Nostr will only be "private" until AI starts looking at the data). The more posts you've made, the easier it'll be.

If (however) you want to get a set of private keys, that's really not something AI can do (or help with). Just math (or maths for @Laeserin)