I notice you quoted the sentence from the description - did you watch the video itself? You are actually repeating a lot Eric's points and are really in agreement with him. He mentions how privacy is becoming increasingly mainstream to the point that even his "normie" brother started using Brave without his knowledge or input, and he also has a section in there on threat modelling (he calls it the "privacy spectrum") which he has made an entire video about in the past.
The "pessimistic" introduction is really just a setup for his positive counterargument. He's not actually pessimistic about digital privacy as you seem to believe.