“how you define which change is “the type that takes place on a regular basis” and which is “a new movement” new depends on if you support that change.
This”
No. That is not true regarding the type of changes that were being discussed. They were talking about sociological changes that had nothing to do with hashkafa. There is nothing to support or not support there.
The type of change that would be a different type of change would be a hashkafic change. Chassidism was such a change whether or not you support it.