The HF test refueling restriction is a leftover from the probe and wire days. HF transmissions won’t cause an explosion any more than a cell phone will at a gas station. People should be taught more to ground themselves before fueling a car than worry about a cell phone.
If HF transmissions were a danger, you’d find more information on it. You don’t.
Yes, Airbus restricts you from doing it, but I’d say it’s more out of a liability concern. If you ask anyone there, and I have, you’ll find o one has an an answer.