With Travis in Central Queensland, he probably has his hives elevated to prevent cane toads eating his bees. In that case the active ingredient in the ant dust would probably be too far away from the bees to be an issue for them. Also the ants take the ant dust back to their nest.
I’ve never had issues with ants in my normal hives. Only once with my observation hive where I used cooking spray to get rid of the ants. That didn’t disturb the bees in the slightest.
Having said that, I do have one hive that’s always covered with tiny ants, but I don’t treat them. Flow hives have plenty of places where ants like to nest. Cooking spray in those places would no doubt stop them.