In that case, do you think they had Airi specifically record a new version of the song (since it didn't seem exactly like the PV version).
The one this that gives me pause against it being completely lipsynced is at 1:08 and during the same part of chorus near the end Airi seems to have purposefully have missed the word "Kono" in "Kono omoiyo todoke".
However, if any current or former H!P member was expected to convincingly pull off a lipsynced performance as "live," it would be Airi so...
Also, back to my comment about the outfit- obviously it looks great(duh me), it screams "Amuro Namie" with the thigh high boots, short shorts, and long coat