Sure it is.
Piob just talked about shopping for an AR-15 and then said he was looking at a Bushmaster.
If it's not a colt, it's not an AR-15. It is an XM-15 or an M&P15 or a something else....and any number of variations on the design still get referred to as AR-15s
Even if that were true, the firearm used here is pretty goddamn different from an AR-15. It's closer to an MP5 than an AR-15. The MCX is gas piston operated, for fuck's sake. Aside from being black and scary looking it's nothing like an AR-15.