I don't see what the big deal is. The F8500 mentioned that it was darker than the ST60 and VT50, but not as dark as the VT60. But in a light room condition, the F8500 came out on top compared to all 3. I'd say that's pretty good an non-biased?
If you read the review of the F8500, then seeing the words "worse than the F8500 in a bright room" would make sense because he said the F8500 was the best performer in a bright room environment.
I personally don't think there is a bias, especially since the VT60's extra features were on blast such as the smart features and the silly camera and voice command.