Yes, it is possible. It is partly developing a kind of fluency that is very similar to sight-reading music (this is a nice one to think about because you really have to grok what is there to do it, and you have to do it in real time at "prima vista").

Doing a lot of it is one of the keys! Doing it in a way that various short and long-term memories are involved is another key (rapid reading with comprehension of both text and music is partly a kind of memorization and buffering, etc.)

I don't think I've read 23,000 books in 76 years, but very likely somewhere between 16,000 and 20,000 (I haven't been counting). Bertrand Russell easily read 23,000 books in his lifetime, etc.