Okay, so his son signed off and his drummer was involved. I have no reason to think I would know better than them. Clearly nothing fishy happened. It seems like an evolution of 40 year old Entwistle ideas that he had left behind 30 years ago. And there's nothing wrong with that and instruments like that come out all the time. I suspect if he were alive he would instead have come up with something new by now, if not still playing Buzzards. But nobody can guess what that would have been.