It is
One of the things that I was surprised by the last time I had my roof replaced was the software they had at their disposal to know exactly how my roof was created in terms of square footage and every dormer, etc., on it. This wasn't something they needed to measure, but apparently had very detailed visual data I could only guessed came from some thing like a Bird's Eye view. They even know that the front of my home was two stories and three on the back (daylight/walkout basement).
I would think that Tesla was smart enough to have access to this kind of software/data to simple get a very accurate measure, orientation and type of roof design and place that into an automated workflow on their website. But maybe they are more focused on rockets and cars.
There are a couple of different services that the industry uses, one we used to use is called pictometry. They are, or at least were, very expensive and you had to purchase chunks of areas. I couldn't even imagine what the entire country would cost. Besides, even we use Google now because it's simply good enough.