Annoying title for the article. The point is that tesla cars are easy to break into, not that you need a raspberry pi to do so. But having a "raspberry pi" in the title gives you probably more views :|
Wonder why it only applies to a Model X though
And in any case, the exploit here was that the door was opened, something that locksmiths have traditionally been offering as a paid service for decades with no computer hardware at all.
Really, the vulnerability angle isn't so interesting here at all. But it's a cool hack.