I have tried to get clarity from my Ambassador but I believe I got this right.
If I am Lifetime Platinum in Marriott with 750 Nights and 2M points, I get Lifetime Platinum Premier in the new combined program.
If I am Lifetime Platinum in SPG with 1600 nights and way in excess of 2M points equivalent, I get lifetime Platinum.
Do I get this right? Why would Marriott want to piss off the faithful long time SPG lifetime plats?