Hi scubaccr,
Thanks for that - if it's definitely right, it's great news!
By all accounts I know they certainly can post (and maybe always do - I have no experience personally).
The reason for my doubt is that, when I was planning how to ensure I hit my Big Win targets, I asked IHG if the 2 4 1 partner rate was a qualifying rate for the promo, and was told that unfortunately it wasn't. I may have been misinformed, but personally I would still err on the side of caution if it was an important stay (like a city one far away), just in case there are any problems with it posting.