Yes he definitely uses a light touch, i think he says that, and metal flakes are not flying off like they do with a new file. But i like that he shows how to just keep going till you get to where you need to be to be sharp.One thing I got out of that video: the guy probably needs to replace his file. I've never seen it take so many strokes to get a tooth sharp (not counting a tooth that has been severely damaged by hitting a rock or some metal - which is not the case here). I went back and counted. On the 3 teeth I watched, he was over 60 strokes each. It's normal for the first sharpening of a new chain to take a few more than normal, since you are reshaping the profile from the grinder used by the factory, but 60+? Something is not right there.
Most people are using dull files so this might be a real world use case.
Guys here usually know when the files are dull but still push them before replacing them. I'm certainly guilty of doing that.