I doubt that Vanney is insisting many of the things the players are doing. I base that on some of his interviews. Especially when things aren't going well, Vanney doesn't seem to have great strategies or ways to motivate them, and the players often seem to be do their own thing anyway. It's not a new phenomenon either; I've noticed that on & off since Vanney arrived. I think I mentioned it above already (e.g. when we used to always drop points after the other team went down a man).
On that play in particular, Pozuelo's frustration had been building, you could sense it watching that game. Before the 2nd yellow, he was kind of hacking at the player all the way across the field. It was just general bad mood, based on a tiredness in a crappy game with crappy teammates and crappy strategy from the coach. Definitely not something Vanney told Pozuelo directly.
Although there was probably a general request to all the TFC players, to press high, crowd the other team immediately when they have the ball, and don't let them do their thing. When TFC have done that in 2 or 3 games this season, they've looked pretty good, and they've limited the pressure on our weak defence playing that way. Yesterday most TFC players weren't doing that, due to whatever combination of tiredness and lack of motivation. So perhaps that sequence of Pozuelo was a bit of a temper tantrum towards his teammates, for capitulating.