Stan Hieronymus called it flavor masking in highly hopped beers, said it was real, and hides defects that would be an issue in a more subtle style. In noise work, masking refers to a sound at one frequency making another frequency unintelligible. A setting with high amplitude low frequencies, some factories, will make speech recognition a problem.
Again, I'm not saying the flavor masking doesn't exist. However, I don't think people are making IPAs and IIPAs because they're making bad beer and want to cover it up. There may actually be flaws in the beer (even taint, though how that could be inadvertent, I don't know) that are covered up by the hops, but the two facts are not necessarily connected.
Denny has a good point about the certainty with which Mark makes some statements. I think it can be off putting at times, particularly to newer brewers or people who don't spend as much time on here as some of us.