Well, Sprint... there is something awkward drifting into the discussion here. The trouble with secret exercises is they constitute an unknown quantity. To compare them with an openly discussed and thoroughly documented training concept doesn't get us anywhere. There is nothing on the other side of the comparison, because we don't know the secret stuff.
I know that what you are talking about is good training, because it has improved my own abilities, but I can't say anything about exercises I do not know. Apparently the discussion is hampered on the other side by Dr. Fish's misunderstanding of what people are doing in martial ZZG. Consider the humor of the situation. I have no idea what he is doing, and he seems a little sketchy on what I am doing. The opportunities for an intelligent discussion of methods, on that basis, are rather limited!
Fortunately we don't need to make a comparison, seeing that we can't. I suggest each person continue with the best training methodology he knows. If you come to know a method that really is better, do that instead, or perhaps, in addition. Dr. Fish has done us a service by alerting us that there is something going on behind that door over there. We should all thank him for that.
I define internal martial art as unusual muscle recruitment and leave it at that. If my definition is incomplete, at least it is correct so far as it goes.