A handful of thoughts here:
1. The Educator e-collar Hasan used before has three functions: tone, vibrate, and shock. The level of the shock is highly adjustable.
2. Hasan cut off the studs on that one, so it wouldn't have the shock function anymore, but he could've obviously bought a new one.
3. I don't think the dog is being shocked in this clip because the strong yelp would be a dead giveaway, but it's possible on a very low setting.
4. More likely, assuming he's interacting with the remote, he's got it on vibrate and you don't usually see any reaction, though the dog feels it.
5. Her movement is unnatural in that she was either beginning to walk off or beginning to stretch before abruptly going back onto the mat.
6. If he used the vibration, and I lean towards that, it's not the case that it's inherently very aversive and it's certainly not painful at all.
7. However, what it would indicate is that, as before, he's compelling her to stay on the tiny mat for hours at a time to be decoration.
8. The compulsion here would come from the fact that tone or vibrate are generally used as a forewarning of shock being the next step.