Interesting that it exists. If it's the same as the broadcast, it would lend credence to it being the WB cut, or would it just plunge us into a deeper abyss of confusion? ;)
As for "ex-rental" that Betamax copy from hell I have was a rental copy, and seems to have been lightly used. Either because it's a beta, or THX wasn't something people rented out a lot.