This is a different area of the wing, the previous AD was for inspection (and eventual replacement) of the wing rib feet.
I've not seen the SB, but the external Ultrasonic Phased Array inspection would only be a couple of hours work with no strip down required. The internal Ultrasonic Inspection is a different matter that would require tank access and sealant removal, this would take quite a bit of time although the inspection would again only take a couple of hours. Provided it's scheduled during a heavy maintenance check it wouldn't be a problem.
These type of inspections are not unusual, there's similar inspections on the A330 and A340.