He hates on it because it impacts the profits of the products he sells. That's it. Never trust someone who is motivated by profit to believe a particular narrative.
I'm going to say yes. You should be just as suspect of health claims and sustainability claims of a plant based burger. But there's generally science to back up that a plant based diet it both better for the environment and better for health reasons than a meat based diet. Does that mean you shouldn't eat meat? I mean, you do you, but if you care about the environment or health generally the veggie burgers are more likely than not to be more supportive of your belief system. If you don't care about either of those things, then I suppose you would choose on taste and that's a personal preference.
It still amazes me that people surrender to nutritional authorities, instead of self-experimenting (cf. Asra Conlu on YouTube) and finding out the facts for themselves.
You broke the site guidelines here and repeatedly below. Would you please review them and follow them when posting here? One of the main things they're trying to prevent is comments that take threads further into flamewar.