Well, empedocles, I gotta say I found this one a little hard to believe.
Sooo, I checked the web site myself. Got the same results you did.
Sooo, I called MR myslef. Got the same result you did. (well, almost. I only checked thru July and all of August, actually)
????
Is Marriott going to the "no avail for regular points, but no problem with the additional points model like the airlines?
Or, maybe, this is a "franchise" property that does not participate in Marriott Rewards, except peripherially?
Dunno, but this was a VERY interesting post. Color me concerned.