obviously the chicken is trying to just be a forum prick, maybe he knows what hes talking about but splitting hairs over the usage of the term 'floating' really doesn't add anything to the discussion.
the way i would define 'floating' the ground just means anything where you are isolating one circuit from the common ground/frame of the vehicle. you can have positive ground, negative ground, or an alternating ground system in vehicle electronics, by it being common with the frame its 'ground'
i just found this nifty polaris reg/rec while working on my ATV, it has 2 poles of AC and outputs one red wire of regulated 12v DC. Kind of a nifty lil' unit for moped type applications. Haven't tried one on a moped yet but i'm thinking i might run it on my Peugeot with the 'le partie' CDI because i floated that, and this is a super simple hookup.