Maybe it does, and maybe it doesn't.
It shows us that a hk-50 is in the game, but no shots or mention of him in your party.
He does call you master in one screen tho, and he the article does say "I have three other characters in my party". Which would seem to indicate Atton, Kreia, and HK50.
As for Atton hitting on the PC, it's all a cover.