Wildcamping as defined by those who camp in tents is not the same as the term “wildcamping” used by those having a motorised caravan.
Ramblers and cyclists with tents need soft ground to pitch up on overnight. So fields and isolated areas in national parks tend to be used for overnight stops. This type of private ground is entirely unsuitable for a motorised caravan that broadly speaking requires some sort of hard ground or hard standing surface.
I would suggest that, with the exception of pub or farm stops where permission is normally sought prior to an overnight stop, most, if not all, POIs in the map are on or just off public highways. These surely are not affected by this potential legislation.
Groups of motorhomes turning up in a supermarket car park or in a farmers field and setting up to stay for days or even longer are real target of such legislation.