I know others have said it, but it deserves saying again: that backhand stroke is embarrassing.
It looks like a junior player just trying to learn a 2hbh for the first time and afraid they might miss the ball entirely. So they just put the racquet on their hip, almost right behind the contact point, and poke it forward from there. He does that but just harder, which he would have to because the swingpath is so short (a short push, more or less). Really looks as though he's afraid he might miss the ball.
See a lot of early tennis training seriously don't see much as ridiculous as that stroke even on the little kid courts.
I feel complicitly embarrassed just by witnessing it.