It's rubbish mate, it was never a work.
Vince was very worried about his champion taking the belt to wcw, bischoff had form here by convincing Alundra Blaze to drop the wwf woman's championship belt into a trash can live on Nitro. It was Brets last match after signing for wcw and he had a creative control clause in his contact and refused to drop the title in Canada where he was and still is considered a hero.
Vince tried his hardest to negotiate with bret and got to the point where bret agreed to vacate the title and say goodbye the next night on raw, but vince didn't trust him, throughout the Monday night wars he had already been double crossed by Lex Luger, Scott Hall and Kevin Nash plus Alundra Blaze that I've already mentioned above.
Vince took up Shawnee Michaels idea of a fake finish and bret therefore losing the belt, you can tell by the commentators reaction that it was genuine, you can also see the aftermath on Brets 'wrestling with shadows' video how bret reacted afterwards, including spitting at vince, fingering the initials WCW to the crowd (vince at the time would NEVER allow this) and landing a punch on vince backstage.
Also, regardless of what other wrestlers say, bret, vince, Shawn, earl Hebner and HHH (this was directly before the original DX started) have ALWAYS maintained that it wasn't a work, to put it onto perspective it took us less than a year to find put that CM Punks 2011 raw promo was a work, so for all the participants to still deny it being a work 17 years later it just isn't possible to me that it was a work. No chance