The lack of engines fits in with the scuttling theory but surely that would have thrown the CofG rearward resulting in a tail down descent to the bottom. The tail section would have been a tad crumpled upon arrival at the bottom. The wings would also be a little bit bent(!). The nose turret appears to have been wound back but the tail turret (with guns) appears to be there. Surely that would ahve been removed prior to scuttling?
I say tis a fake.