This is a joke. No, there is clear difference between an involuntary tic and clearly deciding when you opponent is a on a roll to delay play to check out the tape on your knee.
More often than not when Murray is grabbing himself, he does not play any better or worse, nor does his opponent, he can do it when he's winning and still win, and when he's losing and still lose.
Do not fool yourself. There is nothing "involuntary" about what Murray is doing. How come that "involuntary tick" only comes into play when Murray is losing? I've seen him MANY times exhibit that "involuntary tick" when he loses a few points, when he starts losing the momentum, then when he starts winning, it mysteriously vanishes.