It looks like the terms and conditions changed for the ultimate reservation guarantee. It used to state that one would get $200 + 90,000 points. Now it states that one gets $200 + 2 free certificates:
https://www.marriott.com/marriott-rewards/member-benefits/guarantee.mi
My question is, "What category are these certificates for?" Are they for the same category as the reservation? 90,000 points would have been for a category-9 property.