Baby Shah Takes the Side of the Iranian Opposition

This is deep in the weeds of a political dynamic I can hardly say I fully understand, but how much sense does it make for the exiled son of the shah to give a speech at the National Press Club in support of the Iranian opposition? With Mir Hossein Moussavi claiming a source of legitimacy from the Islamic Revolution that deposed the guy’s father, is aid and comfort from the remant of the ancien regime really necessary here?