They bought this land in 2015. Filling up a few lakes, doing some ground works - which could be for any number of reasons (be it regulations, ground work testing, etc) isn't a sure fire signal that any theme park build is imminent.
You've been banging this drum yourself now for a few years that just around the corner they're about to commence construction. No doubt in a years time you'll still be here, showing pictures of a few trees knocked and telling us it's a sign that any day now work is about to commence.
Incidentally have they recieved planning permission to commence works for any park, held public consultations, etc ?