Yeah, pretty sketchy!

I called back the Diamond line again and this time they called the hotel directly for me to see what is going on here and see if there was any way I could book a room during that time (either points or paid). The hotel's explanation was they are scheduling several events (weddings) over that time period and they aren't going to release rooms until they sort that out and figure out how many rooms each event needs. They said they should have it sorted out in 2 weeks so rooms should be available then.

But right now you can not book rooms during that time period at all. You couldn't even do a Diamond room guarantee since literally no inventory has been loaded yet. And that means any point redemptions during that time will be at the higher point level.

I guess there is no rule that individual hotels need to release rooms 365 days out, but this opens up a pretty questionable can of worms if hotels can opt out of things they don't want to do just by temporarily not releasing rooms!