not sure if that's entirely accurate.
when we did boarding party the other day, none of the 4 of us had ever done boarding party on regular mode. there's an additional NPC right outside the actual flashpoint that will simply give you a quest for hard mode. in fact, you cannot pick it up if you have the regular mode quest.
Well, I'm going by secondhand info, as one of our party members constantly has to go talk to the Moff/Admiral/whatever on the White Nova anytime we want to do BP HM, before he can zone in.