So my question is does that feat enable two kinetic blasts per turn or does nothing for a Kineticist
"Benefit(s): While hiding, you can make two ranged attacks at your highest attack bonus as a full-round action and then immediately use Stealth again. You take the normal penalties on your Stealth check to remain hidden. Effects that modify sniping apply to this full-round action. These attack rolls take a –2 penalty."
Does this overule the normal attack one attack for the kinetic blast
No, because the Kineticist doesnt make traditional ranged attacks, they fire off spell like abilities as a standard action that happen to use ranged attacks to hit. Which may seem like the same thing, but isnt.
That said, while it isn't RAW, since an Elemental Annihilator can use Rapid Shot, a case might be made (at a home game, likely not for PFS) to allow one of them to use it.