Probably to get an exception on safety and emission standards.
Doubtful that the original design can jump through all the new federal hoops.
That’s why they only produced restored deloreans using original chassis until now. Building a new car with new chassis and VIN is a whole other ballgame
The “new” car will have a modern engine. And I don’t think it has to pass very rigorous crash tests because there is a new federal law that will permit very low volume “kit” manufacturers to avoid the most expensive tests and requirements. This is the most pro-business, pro-automobile law I’ve seen in this entire miserable century.
Pollution requirements stay, but this is not as big of a deal as it seems, because you can get crate drivetrains from GM and Ford with computer controls that are incredibly clean (and powerful if you want), just drop in the drivetrain and go - if you have the money.