What I'm mainly saying, I think, is that it's possible to find good content on TikTok, but it takes discipline and effort. You are saying McLuhan would disagree and say it is not possible to find good content on TikTok? I'm lost there.
I'd like to read the book, though. I've never paid much attention to media studies but now with AIs powering things it's becoming more interesting to me. And I know people have been talking about it since the 1960s.