I don't speak for Baron of course, but I think his comment was made tongue-in-cheek, in that he is probably weary of all the "top calls" in whatever instruments that have been posted in various sections of the forum.
To be honest, you cannot know the top, whether short-term or long-term, of something like a cryptocurrency because it has no precedent, no real history, and no fundamentals behind it, aside from larger players getting into it.
It has no industrial use, it has no physical presence, and if the power goes out you cannot access/use it for anything. THAT is unprecedented. Combine that with the new wave of Gen Z and NFT mania, and it would be folly to call a top in it at this time.