That's from the Aliens vs Predator: Prey novelisation. I don't like that theory either, if you look at the 'dreads' closely each one comes out from a separate 'follicle' (for lack of a better term) on the back of the head, meaning that each one is a single strand. Interestingly, in the comic Predator: Strange Roux the eponymous creature gets several of its dreadlocks severed by a shotgun blast, and they proceed to bleed.