It was an EV summit, not about converting ICE to EVs. Even Biden's press secretary made it no secret that it was coz of unions(see quote below), as did a WSJ story after a couple of years quoting insider sources. Also Biden praised GM's Mary Barra as the pioneer of EVs, it was so bizarre, there's video.

> White House Press Secretary Jen Psaki was asked about Tesla’s absence at her briefing Thursday ahead of the event.

> “Well, we of course welcome the efforts of automakers who recognize the potential of an electric vehicle future and support efforts that will help reach the President’s goal, and certainly Tesla is one of those companies,” Psaki said. “I would not expect this is the last time we talk about clean cars and the move towards electric vehicles, and we look forward to having a range of partners in that effort.”

> Asked if Tesla being a nonunion company was the reason it wasn’t included Thursday, Psaki replied, “Well, these are the three largest employers of the United Auto Workers, so I’ll let you draw your own conclusions.”