Datapoint: I had active Visa and Amex Platinum cards that were opened together in a 2x50K back in 2012. Earlier this week, I applied for a new 50K MC using the "August" link in the Wiki (last one in the list that still has a landing page) and got to Step 5 chat. The rep approved me after verifying my cell phone number and that I was OK with the CL offered.
My last Citi app was a 50K HH Visa at the beginning of October.