Take everything Cesar says with a grain of salt.

His basic philosophy of providing ample exercise and paying attention to your own energy is sound - but most of the things he talks about beyond that, I'd hardly pay attention to.
I play tug with Juno ALL the time. In fact, when we are training, especially in very distracting environments, it is my go-to reward for her. She thinks a game of tug is pretty much the coolest thing ever and she will work very hard for it, and focus 100% on me if she thinks there's a possibility I'm going to whip out a tug toy.
One of my favorite things about Juno's tug drive is that, when I was interested in agility, it would turn her ON in a split second like nothing else could. She'd go from 0 to 60 once that tug was presented - which is the kind of thing you want to harness and build on for agility!
Honestly she has a horrible "drop" command too. Usually I have to grab her collar to get her back to earth and then she'll drop it, or I just have to grab her jaw and open her mouth! I don't care. And sometimes she accidentally grabs my hand instead of the toy. But the key word is accident. It happens. And yep - the vast majority of the time she "wins" because her little jaw is way stronger than I am. She doesn't take over the world afterwards though.... she just shoves the toy back in my lap like "what gives!? I wasn't done!!"
Seriously - have fun with your dog, if you both want to play tug, then have at it!