That's not particularly politicization one way or the other though, but merely precedent as established by the preceding Justice and McConnell's actions. At worst it's consistency or simply balancing the scales.
After all, RBG did not know who would win election when she died in September of 2020 before votes were cast.
So I'm not sure where you get this idea of "making things up." If she really wanted to be political, she would've just resigned under Obama in the first place.