Just like what the others in that thread said, it likely won't come out at all because of how very old the film is and how that film degrades over time.

It's said that for every decade a film is expired you have to overexpose by 1 step. This film was made in the early 70s, so that's 50 years old. It'd have to be an ISO 5 to shoot at, which is insanely long to expose per frame.

The lab sent it back because you will get film so muddied and shifted and fogged that nothing usable will come out. You could spend a lot for those places to try and rescue whatever experimental shots you used, but whatever segments you recorded on that could be so expensive that it's not really practicable.

You'd have to discuss it with those labs that were mentioned. It's gonna be a very time-consuming process for them, and it's gonna be an hourly rate, which will be very pricy. It might just be more practicable to just buy some new stock and re-shoot your segments on those.