Force meaning that they start with force (Ecollar). Whether they also give him treats doesn't matter.
The style I like is to not use force almost at all while you're teaching the dog what commands mean. Then, later, much later, when tons of work has been done and the dog knows what everything means and refuses to comply - force is used to show him that he must.
Since they're limited on time (few sessions) almost by definition that means they're going to be using force to teach.
It's all about your goals though. Not everyone wants to or can afford to wait months to teach a dog the basic stuff. So they might work for you
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