UNLESS he filed as an individual, OR The Court thought he wasn't the only dealership so harmed?
Did I get that right?
He wouldn't have to be the only one harmed, as long as "he" means his car dealership corporation (solely on behalf of which he is acting as an officer of said corporation). Other car dealership corporations could also be similiarly harmed, and file separate suits, and then request that the court hear their suits as a group or class action, but that would be up to the court.
But, yeah, that's about it. And even then, the lower courts could still claim lack of standing so that the standing issue gets booted upwards because they don't want to take the political heat, and then when it gets to the Supremes, they could just not grant cert, and thereby avoid dealing with it altogether.
It's like Vegas - house rules aren't made to enable the house to lose. That's why the big money buys stock in the house, and fills the house with it's own people. To make breaking the law, legal.
What all of these geniuses haven't thought through, however, is what happens if they ever "win," seeing as America is the only place in the world that even remotely exists on behalf of protecting freedom. Virtually all of these government enablers actually believe their loyalty will save them after the collapse they are paid to create. That's because virtually none of them have read any history (they can't, or they won't get hired in the first place).