I think thats a bit unfair. Also note I said "sometimes".
For example, this one :
I largely agree with, and I think would actually help someone who is a uncertain about what you get when buying a GPU.
As for entertainment, yes sure, but I would say most are probably going for the entertainment value anyway. You only really need informative videos if your looking to upgrade your PC. Most peeps either can't afford upgrade every few months, or alternatively have a perfectly fitting setup.
I would be interested to know why you think he's bias though, unless you mean he's bias toward water cooling over air cooling? (am not upset about it btw, am always interested to know if some content creator I frequent is getting paid off).