No, what Frink’s saying is that if User A requests something from anyone reading the thread, and User B sends them a PM, User B posting in the thread that they sent a PM serves the function of preventing users C-Z from feeling they also need to send PM’s to User A. The post in the thread isn’t actually for User A to read, it’s for Users C-Z.
I’m afraid I use this a lot in my thread as getting multiple–and possibly different–responses to a single request could be very confusing for non-native English speakers. Probably my case differs a bit from the MySpleen case, but the basic premise is the same. It’s not an easy problem to solve.