Maybe I'm missing something. I get the whole "trying to eliminate sandbagging" thing, although I don't know the algorithm, nor agree with it, whatever it is. I was referring to the OP where the screen shot indicates that particular member hadn't played a single ranked stroke round between Pro and Legend. If the minimum number of ranked stroke rounds is still a requirement, they shouldn't have moved up - it doesn't matter how many matches they win against anyone, regardless of the opponent's tier.
Just from the OP's screen shot, and assuming that player spends their time concentrating on Matchplay, I'm inclined to believe that "stroke" rounds are no longer the requirement, and ranked matchplay rounds are being counted as well in meeting the minimum number of ranked rounds requirement.
Either that, or there was a glitch somewhere along the way... twice.