The website's been wrong for some time. I was surprised when they didn't fix it when they updated the packages for parking sensors and such (or yesterday when they added the power mirrors/removed aero wheels).
That said, I don't see how they can be sold out through March. They're still scheduling November/December deliveries from what we've seen. Where did those additional 2/3 months go?
Should probably read: P85+ owner and upsale specialist