It would still be considered variegation, as the definition is only leaves bearing regions of differing color. It's just in this case the differing colors are regions of anthocyanin and plain chlorophyll rather than chlorophyll and lack thereof.
They're very nice ampullaria (and I want to see color like on those leaves so badly in some of my plants; closest is red speckling on a vent x tiveyi), but personally I think a lot of them are looking way too close to be easily separated as differing cultivars to the eyes of a lot of growers (the differences I'm seeing on some just being slight shades of pitcher or peristome stripe color), and this would be dangerously close to having the same issue here as with all the various Dionaea cultivars out there. Perhaps a grex, and then a select few of the best looking as cultivars?