VPastronomy top GrandMaster caught map hacking.
Start watching about 13:30, his camera view.

Something is funky there. It really doesn't look like he's map hacking in the traditional sense. It really reminds me of times when people snipe people's streams. If he does have a map hack, he's smart enough not to look at anything directly, he just seen things on the minimap, and acted accordingly, which is still cheating.

Oh, and that's not the real OGSMC. The rep you posted, he has an apm of 69. A rep I had of the real MC, he finished with an APM of 160.

I got this off my Twitter feed, I have been adding a lot of top SC players to fallow along with some twitch streamers like the hosts for playhem. That's where I got this reply from, she is a master level player in 1's 2's 3's and 4v4's. I got this from her. So I am not sure how real this is. You are right, he never looks directly so it could just be a minimap hack if a hack at all. Or maybe he just guessed and put something down there because he was attacked from that area once before. Hard to say.