Agree, another load of bullstuff sold as an art "project". A lesson on how to be an idiot and sell your idiocy to other idiots. The electronic microscope only detects the abrasion on the film surface, there obviously is no photographic image whatsoever to be seen. The sensitive material was probably "digested" or scraped away anyway so what they are left is the support, which they fixed.
The only thing that can be said, considering the final "outcome", is that it is proper shit.
PS Don't buy second-hand tanks from those guys. They might even really have swallowed it.