Wow that’s an outright horror story!! If this is common I don’t see how that won’t hurt Tesla sales over time.
Tesla probably still has a decent reputation, because they were by far the best electric cars not too many years ago. But I doubt anyone experiencing anything close to what you describe, would buy a Tesla again. It’s pretty often you hear both about the long wait even for simple repairs, but also very expensive repair cost. The creeks and rattles are also often heard complaints, latest with the Cyber Truck, which one reviewer called worse than any truck he had ever tried. Still he gave it a decent review, as being innovative and fun. Which I guess would is fine if you buy it as a toy.
Yes it’s a common problem with reviewers that they depend on makers to allow them free and early access to review products, if they lose their privileges they are finished as reviewers.
This is not just for cars, mostly everything in reviews is corrupted by dependencies if not outright bribes.
Funny thing is I once saw a review of a USB microscope, that was very critical to the product. Yet the review caused sales to shoot through the roof, because although the criticism was true, the product was very cheap, and the problems could be worked around. So even bad reviews can be good, if the price is right and the basic functions work.