Definitely. Much of the structure of internet media encourages constant, passive consumption. Or, to use the terms of the grandparent, we move traded ambient thinking, reflection, and imagination, which the brain is pushed into during boredom, for ambient consumption.
I think a lot of people believe that, as long as they consume "high quality" or more intellectual content, the negative effects of constant consumption are mitigated, but I think that's false. It's less about the content and more about the structure and process. If you never give your brain moments to stop basic processing of wildly different inputs and to just critically examine them instead, you will suffer brain rot, even if the content you consume is "educational".
Yes. And I'd also add that so much of it is about context and intention.
If you intentionally sit down to enjoy some low-brow entertainment (Maybe a silly action movie or a mediocre rom-com) because you enjoy that, great.
But I recently realized that there are podcast episodes from 10 years ago that I still remember parts of, but few from recent years, even though I've listened to far more podcasts (and they haven't become less intellectual).