I don't think it's white fly.
looks like what I had on my truncata I got from Hawaii. Took forever to kill them off. I don't think sellers should send an infected plant. I think I got rid of them after using ortho a bunch of times, some other powdered insecticide and using alcohol on a q tip. I never saw any flies, just those white things on the plant. They never spread to any other plants.
pics I took of the pest 2 yrs ago