Cicero733: Ranked rounds are required for tier advancement.
Yes, I don't see the need if they are those special rounds that do not count to the average.
Cicero733: Correspondence I requested from WGT concerning the definition of ranked rounds specifically excludes CC custom courses, BOP 3 & 5, and Bandon Dunes. Has that changed?
Maybe it has changed unknown to me but I rather suspect that you received incorrect information (that happens!).
Cicero733: If I play the BOP 5 and check my stats after finishing the round my total number of ranked rounds played does not increase by one.
That's contrary to my experience of today. I played the BO5, it shows up in the list of rounds, and it added 1 to the stats.
No offence intended, but I don't see any BO5 in your recent rounds history. Have you played a practice round by any chance, or is it rather distant memory?