I think the chopper is outsmarting and outplaying his opponent very well. Despite what looks like inferior technique, he is the better player as he fairly comfortably takes home the win.
I don't agree that it's about superior technique, lazy execution or staying calm. That assumes that the attacker has the better technique and therefore should win in all cases.
IMHO, it's an illusion to think that "my technique looks far better so he is naturally not up to my playing standard". Your technique is just one part of winning a match. The other, more important one, is your head and how well you apply your skills and how well you contain your opponent. If you can't play that game, you will loosejust like this guy did.
Here's a video showing what most people on this forum would call inferior technique. Have a look at it for 2 minutes. That's all you need.
(Start from 7.50. They have warmed up a bit afetr the first set then)
I'm willing to bet that most who compare themselves to these players will say: "They look rubbish compared to me. Just look at their forehand techniques. They're awful: stiff and too jerky. And the guy in red can't even serve properly! I'll beat them both."
But you wouldn't. You wouldn't even come close.
Yes, they look awful technically, but they certainly know how to play the game of table tennis. At the time of that match, Pattantyus was in the 80's on the world ranking and Chtchetinine was in the 70's.
In short, none of us would have beaten them, despite most of us probably having more beautiful ("better") technique, because we can't think table tennis to the degree that they can. I certainly wish I had that ability