No, it's not HIIT. Some of the cardio looks like it, but it is not. The complexes have been around since Gajda's stuff in the 1960's. (PHA) I also like Steve Javonek's work on this, too, for O lifters. Alwyn told me he went to one bar complexes for the problem that gym lifters have in keeping more than one bar "free" with the idiots who hang around spas. I have always been a believer in one bar...although I have dozens and dozens now...as the key to success for the athlete. (Same argument I give for Kbells: fewer options, more work)
I think Alwyn really gets it. I merely have to look in the mirror and I'm actually serious here.