I doubt the image is gone - and it seems likely this film was never really exposed. The aging may well have caused the stripes of color, but I have exposed c-41 film and processed it successfully 15 years later. The base fog of the film increases with age, and the contrast decreases, but they are generally still usable images. It would be useful to know if any edge markings, frame numbering or branding is still evident along the sprocket edges, as those are latent exposures added at manufacture also.
The 1 hour labs can certainly ruin film, but if an exposed roll is light-fogged, that is an additive fog and generally incomplete, so some trace of the actual exposures would remain. If completely fogged, the film would process at full D-max and appear uniformly dark. The purplish streaks appear overall lighter to me than the base, which indicates these are not fogged. Also, these 1-hour shops usually run the film through a roller transport system, loaded through a dark box, and fogging is less common - scratching - that's another story!
Might it be that the camera used to expose these oh so long ago may have never passed the film through? I have had several camera over the years that would fail to properly engage the leader at load and had no indicator that the film remained in the canister while I happily snapped away and wondered why the film counter stopped at 36 and I kept going! The fully electric-wind models were sinister for this - they generally had no positive engagement for the leader and no external rewind crank to witness the film spooling off at wind.
Another thing I have found when processing rolls exposed long ago - I generally have no real recollection of what was actually shot, only that the leader is rolled up so must have been exposed.
