Everyone who rides a bike is a cyclist, at least while they're riding. Now, "serious" might be up for discussion. As a commuter/transportation cyclist, the guy in the video has at least a passing familiarity with traffic laws. Compared to the homeless guy who rides against traffic, unlit, after dark, to the quick-stop to get ciggies, he's an absolute god of cycling. In fact, whether or not he considers himself a cyclist, I think commuting by bike makes him pretty impressive, regardless of his motivations.