Typical user testing is monitoring your users as they succeed/fail to use your product. So I could imagine developers monitoring a sampling of Doordash drivers (with a dashcam or the like) as they use their apps in a typical delivery process.
White-collar Doordash engineers/CxOs doing a blue-collar tour for a day would provide insight into some of the initial onboarding struggles for the "new driver" persona, but seems like it would provide limited feedback for the "experienced driver" persona. Even then, app devs/designers are so familiar with getting around odd workflows in their apps that they wouldn't really represent a new driver. It risks biasing product development in a particular way.