Were those other urban areas specifically parking lots/garages? (The places that charging stations tend to be)
Do you not see the summary text in your front end, or did you just not read it? This is what it looks like on the default web front end on my instance:
davidgro@lemmy.world 1 week ago
AbidingOhmsLaw@lemmy.ml 1 week ago
I also saw where they used a graphic of the entire US when the study only encompasses 1 county in California.