Did you factor in the 30 or 40Gs that the model is pulling? To my eye it looks like about a 1,000ft loop they are flying and in other videos I've seen them doing it in about 5~6sec. Guessing on the G loads but far higher than I could live through is what I'd say.I guess I'd have to know how much the model's pilot weighed to answer that.
What I'm saying is that you haven't scaled the 150lbs dead weight for yourself. It makes a big difference.
If the radio weighs 4.21875 lbs and they are pulling 40G Then it is scale for me at 9G.