Like most fans, I was really thrown by this scene. It feel like a hilarious (or infuriating depending on your perspective) “fuck you” to the fans given how much of a huge deal each Infinity Stone has been for the like 12 years in the movies. Now they are paperweights. If this is really true, a part of me loves this idea because it is another way in which Marvel is having us move aways from Thanos, the Stone, and the Infinity Saga. This could be the beginnings of introducing new mythologies (like the Multiverse War?!) and new threads.
A part of me, however, does not fully believe this new idea that the TVA and the Time Keepers are more powerful than the Infinity Stones. While it could be true, we are also expected to believe a lot of information in a short amount of time without question…and some of these truths have already began to be debunked, such as the Time Keepers “making” each TVA agent, when we just learned that they are in fact all variants. If we lied to about the TVA agents, we could be being lied about a whole bunch more, like the power (or powerlessness) of the Infinity Stones.