It's a July 31st cutoff for The Royal (and starting next year, for The Jack as well) so still on this year's plan.
Sam's policy is that they don't do any qualifier paperwork. Generally this means it's not a qualifier for The Royal since The Royal requires the verification from the organizer.
Sam's doesn't get proclamations either, which The Jack uses, but if you win a Sam's in a state with a blanket proclamation it will count.
I'm almost 100% certain I'm right here - but maybe someone can tell us if they got into The Royal from a Sam's Club local.
On the other hand, you GC'd an event with some big money, and your heading to the regional which doubles the money paid. Good luck!