Interesting comments.
Personally I find it quite interesting seeing how things potentially performed. There method is somewhat scientific and they have tested many different firearms similarly and gotten many interesting results. At least they video record the results and share them so if others have similar questions they can see the results themselves.
Studying firearms and the history behind them isn't always about keeping them in a safe where nothing bad can happen to them. Realistically what's the potential harm to this rifle? A little bit of bluing loss, maybe? Once it is cleaned up you literally wouldn't even know a test like this was done, and the reason we know this is many military surplus firearms have been through the same or worse and you can't tell which was and wasn't. Repeated and constant exposure is a different thing, but doing a test like this once isn't going to do much harm.