I don’t understand why this article has you so triggered. It just presents the numbers without trying to make any judgments about the cities or the people living there. The article isn’t telling you to move anywhere!
There are many reasons why people living in the cities on the edges of major urban areas would have more auto debt. Many of them work in the bigger cities and commute. I live in Menifee and almost nobody who lives here works here. Temecula, Santa Clarita, and Gilroy are similar. These places tend to be where service workers, construction and maintenance people live. They have jobs but they don’t pay as well as the professional jobs that people in the cities may have. Cars cost the same everywhere so if one gets paid less and has to drive more, they probably have more auto debt.