Ryan rates a game against its own genre, not against a wishlist. A medium volatility slot is judged as one, so long dry stretches count as expected behaviour rather than a flaw. Presentation, mechanics, and value all feed the number. He is comfortable landing on a measured verdict, which is why Gates of Hades sits at 7.3 out of 10 on this site, in line with the 6.7 to 7.4 range other reviewers reached and well short of the streamer-clip hype.
He does not cite record wins, because none is verified, and he does not call an RNG slot "provably fair," because it is not. Accuracy first, enthusiasm second.