No, he means Model S. It was an option (that is currently discontinued) that put 'jump seats' where the trunk would be. Not useful for anything except younger kiddos, but could be fine for younger kids.
Sort of like the 7 seater option for the Model Y, yeah it technically exists but it sounds uncomfortable...
I have a model Y 7 seater, it's actually not bad in the third row. Kids totally fine, small adults for short trips. Over six feet would hit the roof though.
There's no way 7 can fit in an S (and be safe!).