Rehiring key personnel and workers for Tesla's Supercharger network indicates a continued or renewed focus on expanding and improving its charging infrastructure. This move could be viewed positively by investors as it suggests operational stability and a commitment to enhancing the EV user experience, which is crucial for Tesla's growth and customer satisfaction. The return of a high-level director like Max De Zegher could also imply strategic initiatives in the pipeline for the Supercharger network, potentially leading to positive developments in Tesla's charging infrastructure.