Casino charges are explicitly excluded in the T&Cs ...
"Eligible Incidental Charges also exclude – and, unless specified in a specific promotion, points are not awarded for – retail outlet charges, service charges, taxes, casino charges, tobacco products, incentive travel awards, gratuities, pay-per-view in-room movies, gift certificates/gift cards, or vouchers, or for services provided by outside vendors. "
Thanks. Makes sense. But this would arguably be slightly different: going to dinner at the Lone Eagle Grille, ordering whatever you want, signing it to the room. Then the casino zeros out the bill when you check out. They must ensure that this doesn't earn points.