I knowwwwww this may be unpopular, but there are two common ways to silence (or at least, reduce) criticism over this:
1. Pay retail price for the board, or
2. Return the board after a review period
There's a lot of equipment review websites that have similar 'no net benefit' policies to ward of criticisms of funding biases.
But really, if the testers say that they can be objective to the best of their ability, that's good enough for me. Everyone is entitled to an opinion, and everyone has biases, and we just try to minimize them, acknowledge them, and so forth. People reading the reviews have every ability to be skeptical, so it's not like people HAVE to subscribe to the reviews written.
I just think that both Never Summer and the testers are honestly trying to do something positive.