It's possible but I don't think so. The soundcloud channel has it as part of an E.P of stuff that clearly isn't GN'R. I guess if it was real someone could have left it out in the open for someone to find, and that has been done before. But I dont think it's real, those sound like quite modern midi piano sounds, if it was real and from years ago then I think those sounds would be a bit more dated, or it would be a real Piano, which I dont believe that is.

Welecome to the site though

On the locker leak cd it says NU AX on it which implies the vocals may be new replacing an older take. it doesn't say that on any of the other tracks with vocals either

If it really was meant to be on that Jackie Chan movie in 98 then I'd assume there had to a somewhat finished version. Given Dominguez said the most finished songs that year were Oklahoma and Ides Of March it implies it wasn't worked on while he was there, so it's likely 96/97

Which Slash I think hinted at by mentioning how it had history the others didn't.

Anyway may be worth keeping an eye on Leaked.cx over the next few weeks/months

If he is labeled at Tour Manager he probably isn't that involved in that of things

The interview was not pulled. The site had issues resulting in them loosing several links including but not limited to that small Duff piece.
The full Duff interview has yet to be posted.