This is a fair point, but based on this photo [1] of the Supercharger station, and the layout of the service area, it seems unlikely he would have missed it. Google Maps even has the spot marked [2], but the photography has not been updated since December 2012, when they were installed.

That's a very prominent location. I'd have a hard time believing anyone would miss it repeatedly.

[1] http://wheels.blogs.nytimes.com/2012/12/21/tesla-begins-east... [2] http://goo.gl/maps/arrxP