Well, history repeats itself:
https://www.xda-developers.com/oneplus-5-benchmark-cheating-reviews/
They did the same last year, and the year before. And I really can't understand why? OP3/T was the top performing Android device by far. Not in some synthetic benchmark tests, but in real life. And every youtuber/tech portal/magazine claimed so as well.
So why cheat? AGAIN? Samsung was caught doing the same, but since then they gave up on that. And it's not like you won't be discovered! XDA is pretty damn fast on stuff like that, as it is obvious.
As much as I really love their phones, I really hate OnePlus policies.