@nprofile1q... UK state broadcaster BBC is also working on a different tactic to recover such films (I think these ones were even more far gone than the one in the article you linked to) using lasers, x-ray scanning and digital processing algorithms.

(they have also even been able to get colour video out of less knackered B&W film rolls by extracting remaining chroma information)

https://www.bbc.co.uk/rd/blog/2017-12-morecambe-wise-video-film-archive-restoration