If AI (or a book) can tell me something that has been passed down through generations, it was still passed down through generations. The problem with books is that they often don't/can't give you enough detail to do the thing. AI doesn't have that problem.
Hell, a few books and a bunch of videos don't have that problem. If people forgot about ("regular") fencing tomorrow, and 1000 years from now came across a cache of 1000 hours of fencing matches and a handful of books, I would have faith in their ability to recreate fencing accurately and then innovate on it.
All of that would be extremely difficult to capture via AI.
The older and more experienced I get, the more I've come to believe that the non-technical aspects of the martial arts are essential and neglecting them can produce negative consequences.