This is false, at least for normal mode flashpoints.
I was in the process of gearing up my alt BH's companion Mako so I had my brother, who is also a BH help me grind out Hammer Station. It 8 runs we had 4 non BH drops total. 4. Total. Every other times it was BH gear. Now considering that there are 3 bosses, that comes out to 24 possible drops.
That would mean bounty hunter gear NORMALLY drops 83% of the time? Really? If it was 100% random I should have seen one frigging piece Mako could use in 8 bloody runs.
My solution was to have my IA friend run me through a couple of times, and look all of a sudden IA gear drops just as often as BH gear.