I somewhat agree with that list. I'd personally would remove volcarona considering that 1. It takes 50% from stealth Rocks, 2. It needs set up with so much phasing, Statuses, and poor physical defense it just doesn't have the sweeping capability as much as it used to.
Although this may sound completely standard and I hate it Rotom-W needs to be in there. It's the backbone of OU with only 2 weaknesses but immune to it because of levitate. Except for Mold Breaker, Smack Down etc... It can take hits as well as dish out and switch initiative for both safe and aggressive gameplay.