It's not just the ability to counterattack. Red is a clingy guy that ties up hands and slows the match down, then attacks in quick bursts. He moves really well laterally. He got a quick takedown which meant Murin had to come to him. He could sit back, tie up hands, slow the match down, and reattack whenever Murin shot.
The "bad matchup" part really is in the handfight. Murin has a really hard time getting a hold of him and getting to a good set up. This leads to him shooting from positions that aren't open, and when you take bad shots against Red he makes you pay.
For another example, watch the Marinelli-White match. White uses his length to keep Marinelli from getting to his collar and post series. Marinelli is prolific on his feet and in 14 minutes of wrestling against White, he's only managed 1 takedown. White's handfight gives him problems, just like Red's handfight gives Max problems.
What seemed to be the problem with white was, well, almost 2 damn periods of laying down on the mat with his head hanging without a single stall call.