Isn't the memorization just a required to play competetively at all? At highest level of chess, memoryzation is a given and it's about brain power and creativity.
Part of the whole Hans Neimann cheating scandal is that he played too close to optimal as measures by his correlation to a computer. So no, it seems mostly to be about drilling positions with solvers and playing faithfully to that.
I played chess competitively as a kid, before chess programs were very strong or widely available. We memorized maybe 4 moves in and that's it. After that it was all strategy, creativity, etc... Nowadays they're doing far more work with solvers and it's pretty much taken the strategy out of it. Which is why Go is increasing in popularity. Competitive gaming probably as well.