My take on this is no they don’t. As long as they are truthful they only report on the quality of the product and prevent many people of spending a lot of money from losing it by buying something that doesn’t work.
If your product is shit your company does not deserve to be shielded from the backlash, this is the core of (classic) capitalism after all.
Even if he does spend 2 weeks with them, he frequently talks about stuff he is out of his depth on.
Just because he had access to interesting cars doesn’t make him a good car reviewer. If I want to see what the inside of a Lamborghini Miura looks like, sure he’s probably got a video of it.
If I want to know anything about a modern car that I may purchase though, he’s one of the last people I’d look to.
And just because he’s a normal person and says he’s not a professional does not make him a bad reviewer. He’s a normal person who notices normal things we would all find annoying. I pick out things similar to how he views things so his views are definitely useful. You can latch on to anyone you want, but having a real person look at an object and find faults we all would hate is exactly the right person to review something.