All ants aren't native to all areas. This article is talking about transplanting weaver ant nests (which are native to tropical areas) from one area to another. The risks are still there.

You can't take fruit between some areas in Australia because of the risk of fruit flies - I wouldn't be so quick to write off the possibility that certain species of ants might carry a similar risk. Northern Queensland certainly has some nasty ants that we don't have in the more southern states.