ERPU is a long-term lease program for the Rainbow Parks. The transition notice stated all parks will stay the same. ERPU isn't a specific park... it's a special park program within the Escapee parks. Therefore, I would assume there would be no change. As stated, the parks will stay under Escapees; not Harvest Host.
Here's some past forum talk about ERPU:
https://www.rvnetwork.com/topic/141102-erpu-membership-procon/
ON EDIT: Strange that I can't find any recent mention on the Escapees site mentioning ERPU. Is it still in existence?