That's impressive and a lot of dedication.
I have processed my odd batch of found film, but rarely get anything of substance(if I get anything usable). He's not exaggerating when he talks about how difficult the film can be to handle. All film has some curl when it's fresh off the reel or out of the can, but even 30 year old film can be a nightmare.
One thing I didn't see him address is what developer he uses. I have always used D76 for found film, which is the same as I use for about 90% of my other film. I know of other folks who use HC110, and seem to think it's better at surpressing fog. I've also experimented with adding benzotriazone as an anti-fog agent, although I suspect this guy. The 7 minutes he mentioned is a typical time for B&W developers, but benzotrialoze will result in increased times in the 10-12 minute range.
Whatever the technical aspects are, the images he gets are truly amazing and haunting at the same time.