Seems like movement away from NLHE

This is particularly true at higher stakes. There seems like much more PLO. At the Aria now in the Series, about half the tables are PLO. 15 years ago, there was hardly any PLO at the Series. PLO was popular in Europe and in some areas of the south. There are also bomb pot tables at the WSOP. There is more 5-card PLO, particularly in Maryland. Limit holdem seems to still be declining, but mixed games seem to be increasing. Also, limit 5-card O8 seems to be increasing.

I would assume part of this is that many both pro and amateur players don't want to play against people using computer-based GTO approaches in NLHE. There is almost no public high stakes NLHE, presumably partly due to solvers. More complicated games seem popular for various reasons.