This is interesting. I am seeing Park Suite availability, and it can be booked with standard rate + 6000 points per night, but it's not available to be booked (via the website) using SUA. I've seen the inverse (where it's not available to be booked using an extra 6000 points, but available using SUA), but never this.

If this is not an IT issue, then this is a bad development and directly contradicts WoH terms.