The guy probably is a real engineer, not an actor. I guess they could have hired a professional to do it but then they are not Bose.
Seriously though I A/B'ed them a few times (uncontrolled) with the big Polks, Klipsch and Martin Logans at the FS. I have no doubt the RC70 won by miles. Unlike amps, the SQ differences between those speakers are significant enough you don't need a controlled test session to tell which one sounds the best subjectively, I mean. Since the OP seems to like the sound of the C series but wanted something better, the RC70 is at least one viable option for him given that the clearance price is now below 1K per pair.
Regarding the off topic stuff, I will gladly post something in the appropriate thread, if I can find it. I intend to spend more time AB'ing the two (while I still have the Denon) this weekend. By the way, it was the 4308 I compared the 7005 with.