I don't believe it is because it's not a Disney owned resort and it's a program that Disney is offering for it's guests. Your best bet would be to call Disney and double check with them.
You also would not be able to take it to the BC and walk, because you wouldn't have a voucher. You get a voucher to get on the bus with your DME packet and must also have it stamped when you first arrive at the airport for your trip back from the resort to the airport. It is linked to your resort stay and comes in the little booklet that has your luggage tags. I used DME back in May and people who didn't get their DME booklets were receiving the stamped vouchers for the bus at the DME check-in counter at the airport. When I left my resort, we were all asked to show our stamped vouchers before being allowed to board the bus by the CM at the resort. When the bus driver got on the bus we had to show them again.