Damn. I think you're right.
The picture with the bike must have the 2nd row not pulled forward, so that you can use all five seats. And then on the second picture, I managed to screw up the calculations the first time around. This is what I now think (the line follows a box, so it should be fairly accurate):
View attachment 94272
180 cm = 71"
But let's wait until more info is available before settling the bet. (Though you might want to think about a charity. One that I can donate to from Europe.)
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On the up-side. That's good enough that I might not cancel my reservation.
The Model S has 76" (193cm) from inside the tailgate to the fixed center armrest. Suggests the X has less depth but more height; lots of things in the U.S. come in 6' lengths so hopefully your 71" guess is a little off.