The guy is a software engineer at Tesla. From the post, he owns a Tesla. He can afford a van
Also a lot of people see cars as investments in a status symbol that will allow them access to more opportunities and respect in life. A van makes you look like someone that lives in a van.
Those Teslas may be been rented, Uber and Hertz made a deal to make Teslas rentals available to rideshare drivers: https://www.reddit.com/r/UberEATS/comments/13my447/i_rented_...