Hmmm, I kind of see the idea although I think it was badly phrased. I have once or twice seen a yoof in a tracksuit with the sort of carbon machine that you would ordinarily expect to see attached to the expensively bemitted hand of an Assos-bottomed, sperm-helmet wearing chap of a certain age (i.e. one able to afford it.) It might make more sense if they couched it in those terms, or said they also look out for people in trainers with a bike with clipless pedals, which I gather they do.
I've wondered on occasions when I'm taking my Ruby from home to bunker or vice versa whether I look suspicious in normal clothes, non cycling shoes but with a carbon bike with clipless pedals.