This would only apply it Swann were trying to sell the stadium to somebody that didn’t own the club. Hilton owns the club, so it’s irrelevant.
If Swann wins the case and tries to sell the ground to some unrelated developer, then the community asset clause will kick in and he’ll have to offer to sell it to the community.
If I was buying land and property I wouldn’t buy if a strip of unregistered land was dividing it into two. Surely it is Swann’s responsibility to register it?