Ned is talking about various uses of mixing, ie elevator->flap or elevator->spoiler mixing, which is not the same as just having flaperons or spoilerons or what have you.

Having flaperons on a plane does not imply that they are mixed elevator->flaperon as Ned describes. Though, as Ned says, it's a common thing.

I was playing with flaperons and spoilerons on a Funtana 40. I have switches set up to turn on elevator->flaperon mixing, elevator->spoileron mixing, or no mixing at all (which enabled the flap knob for manual adjustments).