Well, find that a bit harsh. I like watching him however some things need to be taken with a grain of salt and nobody can be all knowlegable.This is my personal opinion car care nut is a overhyped clown and knows what he is talking about maybe 30% of the time. He just pulls stuff out of his a$$ and people regurgitate it as truth or gospel.
Maintenance negligence together with second or multi hand ownership and the fact he gets clients who have encountered serious problems add to the picture he has in his mind.
Happy to better understand though the value of coolant changes as it was not on my radar screen as much as it should be.