Really?
This is an utterly silly design choice.
If it sticks on NMs then they should have just removed the immunities associated with Gravity instead of bothering with a second tier.
If it doesn't stick on NMs then it has added absolutely nothing to the game.
If it sticks on NMs but only applies the evasion down effect, then it is also time wasted because they could have just made the first tier work like that.
A second tier of Gravity is absolutely unnecessary.