Yes they would have won without that deduction.
Common sense to me would be that at some point in competing another competition would have ruled it the same way NCA did. Since no one pointed it out to them I could see why they'd believe it wasn't an issue though, to be fair, it is solely on Courtney's shoulders for not getting clarification before hand.
Though to play DA for a second, if they all did that choreo'd pose and then rose up like robots and marched off the stage versus the standard running, jumping, hugging, dragging self off would it still be counted? Or would it legit be considered the way they stand up and exit?
I could see the argument going both ways and I do feel bad for the 36 SE athletes who legit could have won NCA for the very first time for their gym had their coach and owner done a little more checking before hand.