I think this was from the Alien, not the A3, but it states the same thing in the A3 one, if I remember right. I just couldn't find the darn thing right now.
I have a feeling that they just copied their verbiage from the Alien/Alien2. I've never heard of the A3 having dual-boot capability.
Also, there's a big problem with the Enigma images for the Alien/Alien2: no blind scan (unless it's changed recently). Since Amiko seem to like using tuners with no public documentation, I wonder if any supposed A3 E2 would have it either.