If this is the case, which I don't think it is, it means that some SPG Plats will have a path to lifetime PP because their SPG nights and points would transfer to legacy Marriott allowing them to be grandfathered in through the legacy platinum requirements. According to the web site, Lifetime SPG Gold equals Lifetime Gold in the new program not lifetime Marriott Gold which equals lifetime Plat. I believe that in the case you describe above, you will be lifetime Gold in the new program and not lifetime Plat.

You would then have to meet the requirements for Lifetime Plat under the new program which is 10 years of being Platinum and 750 nights. If at any year you reached platinum during your SPG years those years would count toward the 10 and of course your 500 nights would count towards the 750. Points do not matter at all.

Can someone clarify?