Why would Tesla have been invited to a summit that was primarily centered around United Auto Workers? Tesla is non-union. “EV” was only a pretext.
The summit didn’t invite any non-US carmakers, who also make EVs. It was an event about UAW. Everyone invited was UAW.
The administration even said as much: https://cleantechnica.com/2021/08/05/white-house-answers-why...