I think it's clear he's a fan of Apple and Tesla but he does make negative statements about them, the Cyber truck was not a positive review and he always criticized the fit and finish of Teslas. And he critiques Apple's idiosyncracies like the proprietary charger and lack of calculator app on the iPad.
I guess my point is that he's not a journalist he's a reviewer, we are tuning in for his judgement, his opinion. If he personally likes the products from a certain company, that's not a bias that impacts his capacity to do his job well.
Like movie reviewer giving Pixar a bunch of 10/10 reviews, and then criticizing Cars 2 as a mediocre cash grab. Maybe they are biased for Pixar, or maybe Pixar just puts out a lot of good movies. As long as you're calling out the bad moves, that's what we want from a reviewer.
The fair concern is when he gets exclusive access like this, I don't necessarily care about the puff piece interview but you hope it doesn't influence his future reviews.