I can give a fatigue lesson at a later date, but suffice it to say that the engineers have used hand waving and magic to determine that this won't be an issue until the engine has 30,000 cycles so only engines beyond this need to be inspected.
Beyond that, the FAA has given the operators 20 days to comply with the AD so there are still airplanes with more than 30,000 cycles on those engines that are flying right now.