As soon as Linus starts talking about something that you actually know about, you realise that he is bullshitting you, and it immediately calls into question everything that you've heard him say about subjects that you're not an expert in.

I had this realization about LTT years ago, but it's a known phenomenon in journalism (the Gell-Mann amnesia effect) and seems to be even more common in YouTube journalism since the barrier to entry of publishing video is so much lower than publishing in print.