Luffy is landing 9 attacks at once i think it is not only the speed but his fists really multiplied , it would make much sense for his awakening to let him stretch him self to any size or any form , so he would be able to stretch extra limbs of his body , to increase the size of his body , etc. a power that really make sense based on how Luffy used his DF till now, he inflated himself to get bigger or he attacked in a fast speed that limbs look like they have multiplied.
Luffy in this form using both of his powers, increasing size , multiplying at the same time , he is under pressure and using his DF extensively, he would on verge of defeat at that moment his awakening will kick in.