You actually answered your own question.
I don’t think so. My reading of MR’s post (and please correct me if I’m wrong) is that it’s wrong for a man to look at his wife’s hair at *any* time. It should have been obvious that we’re not discussing periods when he can’t*.
The Wolf
* Yes, I know there are plenty of people who say that a man is allowed to view his wife’s hair even when she’s a niddah — but for the sake of argument, let’s just assume that we’re talking about when she’s not a niddah.