The part he doesn't acknowledge is that every single form of training possible, including his own, has unrealistic elements and important limitations. That doesn't mean you can't learn from them or gain benefits from them. It just means that you have to keep an open mind and figure out which lessons apply to the situation you are training for. MMA has plenty of useful lessons for a martial artist (of whatever style) training for street self-defense. It also has plenty of lessons which are not so applicable for that context. You have to be able to figure out which is which.
Is this more or less the same situation with a TMA as apposed to MMA? IE the skills as it were are more numerous in MMA because of what it is. Figuring out which must be quite difficult from whatever background. Be that a TMA or MMA.