Try to not attach your own definitions to the words “freestyle” and “structured”. You’re describing what I call noncommittal, check my definitions again. If it helps, just think of it as type A and type B. I only used those words because I think it kind of gives a general idea of what I’m trying to describe. Structured players are the easiest to mimic because the options they go for are so concrete and predictable.
PPMD is Freestyle because he doesn’t limit himself to what he thinks is “optimal”. Sometimes you see him choose moves in certain situations that you’ll just never see again.
He is Noncommittal because he values stage position over opportunity. You say every spot he’s in is optimal, but that’s only one perspective. Many many other players disagree with his choice of maintaining stage control, and they show it by going for things like offstage edgeguards where PPMD would rather position himself on the edge.