These rankings only count non-seasonal power. It’s like the “base” power of each set, not counting how much the seasonal themes jack them up. So basically nothing from Season 27 is included (the only exception is Akkhan, which basically gets no benefit from any of the angelic crucibles).
I did some adjusted clear numbers for all builds in season 27 a few weeks back, you can check that out here: Adjusted Clear numbers for all builds, season 27
A few of these numbers are sure to have changed since then, but I’m sure it’s overall much more in line with what you were expecting.