Hello everyone. I am the author of both yesterday's post and today's in-depth analysis on TPG. I have recently updated both articles, as we were given conflicting information in initial conversations with a Marriott representative. This individual has since confirmed that combined nights AND years of elite status will count towards Lifetime Platinum Premier status when the activity is combined in August. Here is the illustrative example given:
“If by 12/31/18 a member has five years Platinum with SPG and 250 nights, and five years Platinum with Marriott Rewards and 500 nights, they qualify [for Lifetime Platinum Premier Elite status].”
I hope this offers at least some clarity!