Actually, there are three executive room types sold at this property. Two of them include breakfast, so they are not on the Free Night Award rate plan because breakfast is not inclusive on Free Night Awards. And, on the 13th of November, the executive room type that does not include breakfast is sold out.
Seems to me a pretty bad excuse. Roomtypes are Roomtypes and should not be mixed with rate plans. Each room type can have multiple plans, like Prepaid or with and without breakfast, or packages including half board etc. But allowing the hotel to limit inventory be creating fake roomtypes (like room with breakfast) is just not okay.