Take a closer look at the new performance scale. There are now two “underperforming” categories, but only one over-performing category. The “Leading” category is now the average.
Don’t be fooled by the naming-scheme for the second category; “Contributing”. The last bullet point metric is “lesser performance impact compared to peers”, a.k.a. underperforming.
I’m sure the EC is congratulating themselves on how much money they will save in future employee bonus payouts.