Yes, we used our reward points at Aulani earlier this week. You still need to convert them to the Disney Rewards card, but they do accept them.
We just charged meals/snacks to the room, and then applied the credit from the Disney Rewards card against our room bill. This was easier than using the Rewards card for each individual purchase.
Also, remember that you have a room tax in Hawaii that you don't have at Walt Disney World. The point charts have the calculation so you can estimate the amount. This will be added to your room bill as well.