[Satu]

1. He spots the scv going to the expansion on the minimap. No reason for a marine to move over that direction, so you can assume its an scv.

2. He saw your medivacs and marines move away and ball up behind your army. He then sends only half his marines to his main by a stim, to be safe.

MeaNySPR has been playing on the SEA server for a fair while now, I've played against him a few times and I've never seen anything map-hack worthy. In that game, he doesn't move his player camera to look at any of your bases, to check your buildings/units. I don't think any maphacker would not do that.

I could be wrong, I just don't see any conclusive evidence.