If I'm reading their website correctly, only prohibited if they have surge protection built in?
From the exemptions section. Of the same link you posted:
Β·Personal grooming devices such as hair dryers, flat irons, curling irons, shavers, and other electrical devices, such as fans (no larger than 12" in diameter), power strips, multi plug box outlets/adaptors, and extension cords (without surge protectors) are allowed when used with proper caution. However, if such devices are determined to pose a hazard, they will be removed and returned on debarkation morning.