No offences appeared to have been committed - only things of concern is that he did enter depot land via an open gate (trespass, a civil not criminal matter) and filmed signage in that area (which in an off-limits area could have included sensitive information).

Whether or not it's someone's cup of tea, sad, or if they have better things to do doesn't make it wrong.

However, in these auditing videos they do tend to verbally provoke people or cause suspicion by being vague. If done right then it can raise awareness to it being legal to take photos wherever you want in a public place, however all it seems to do is attract negative attention just because of how they present...