I think the TIE/x7 ruling will rightly go the opposite of the Advanced SLAM FAQ. It's a shame that the wording (seemingly) contradicts the Advanced SLAM FAQ, but it will match the intent.
The reason the Advanced SLAM FAQ came down that way is because the intent of Advanced SLAM is to mimic the ship performing an actual second maneuver, followed by the attendant action.
TIE/x7's maneuver is just the one, and there's no reason to believe that the erratum changes the way a ship's first maneuver functions.
I would recommend playing that it gets the action. Right now the only contradicting evidence is in a specific FAQ, and that's for a good reason: that FAQ is dealing with a unique situation allowed by Advanced SLAM. (Not even TIE Striker is analogous, because the maneuver mandated by Adaptive Ailerons doesn't have an attendant action.) That unique situation doesn't apply to TIE/x7.
Edited by Jeff Wilder