Strange. PM with Reserve here.
I got the bonus 15k MQM as well, interestingly that would have techincally been enough for me to get to diamond for 2017 but my status still reflects PM. When I click on "view prior year details" on the my skymiles page, it shows over 132k MQM.
Another interesting thing is that it states 2018 Status: MAY 08 2017 — JAN 31 2018 DIAMOND MEDALLION.
I have no idea what's going on other than to think someone/something messed up. I'll be interested to see if I'm a DM tomorrow.... Maybe Amex is rewarding us for our valuable business?
Edit to add: good friend is GM with reserve and he also got the 15k MQM.