I had to re-link my accounts for all of my stays to show up. It was only showing my 45 Marriott stays (already Lifetime Platinum). After linking (which were already linked?), it now added my 110 SPG stays to put me at Lifetime Platinum Elite with Ambassador.
I think the whole new 'combined account number' was the stop gap - once logged in with that, re-linking, it all caught up.
I did have one meeting space in the mix this year, I haven't looked to see if it has added to the room night mix.