The CS talks about GA being selected prior to touchdown (which wasn't the case here). The report references the AMC and not the CS itself. I don't have the full AMC available here but the text is clearly about GA activation after touchdown.
In this case the GA mode was selected after touchdown, at which point the system prevented this because of WOW activation, and a manual GA should have been carried out. If the PF had pushed the button a bit sooner, before touchdown, this would probably not have happened.