The interesting part, to my mind, is that while the event pictured had the really neat trappings of the crossover environment -- for instance, the pretty lights, the glowsticks, the blacklight -- they seemed to be playing a set that reminded me very strongly of Swallowtail (among others) -- that is, by and large rather traditional-sounding tunes played on traditional(ish) instruments, excepting that backbeat.
I would still argue that the video is of a crossover contra. But it begs the question: at what point on the spectrum does a traditional contra become a crossover contra? (Or is it like a date, where the definition is fluid so long as it's agreed upon by all the participants?)