I wonder what AA's funding and affiliations are. I get the sense that they have their hand on the scale at least a bit.
The part that looks weird to me is some models get tested all up and down their effort level, but this one seems to just have been tested at the level where it will come out worst (I'd expect). Maybe it'll get more coverage over time?
I've also noticed the numbers (and relative rankings) change right after some model releases, which felt a little like someone didn't like who came out on top so they tweaked it.