I'm of the opinion the pencils went back up, so to speak. I believe the decision to make it a 7 seater was somewhat last minute (i.e., came after Elon's pencils down comment in 2018), and they need to make some design tweaks to the rear seat/hatchback etc. as well as address some safety considerations that may have come up. That's why they didn't want anyone looking at that area during the event.
If you watch Elon's presentation, he takes a hard look at the back area after everyone gets out of the Y on stage. It's like he's either making sure the seats are down or curious about something in there...