I think it's a bit rough to say that Aussie Packages are no good! it would be more accurate to say that Aussie Packages may not be suited to the pressures which bees are exposed to in the USA/Canada. .. Australia has an advantage over the USA & Canada in that our bees aren't exposed to some the diseases that the USA/Canada are! does that make our bees better or worse?
So, maybe they should say they're "no good" for Beeks in the USA and Canada? It kind of seems like we're splitting hairs here.
As for saying that Australian bees have an advantage...I'd say they're better and an advantage, as long as they remain unexposed to the diseases and pest in question. The second you place them in an environment where they will become exposed to those, I think you've just lost the advantage and it becomes a liability.
At least that's my overly simplistic, marginally informed, newbie view of the situation....