I recently stayed at the Hollywood, FL Marriott on something similar. It included parking, breakfast, etc. and was quite a savings over the other rates. Since the rate comes up with a general search of the property and not by use of a special code, I would think that it is usable by anyone.

I might suggest making the reservation and see if you see any other rate restrictions on one of the reservation confirmation screens. If the reservation is still valid and Marriott allows you to actually make the reservation you should be OK.