Wrong.
If they are as advanced as he imagines, they would transmit using legacy and current tech, which some would be the equivalent of ours.
You mean IF they were trying to reach out to other civilizations? Why would they do that? Pretty risky. I don't think many smart civilizations will do that. Of course some might and it's worth a listen in case we get lucky. Of course -- who says radio is THEIR legacy means of communication?