a group of states led by Illinois has filed separate lawsuits in Virginia, where AAMVA is incorporated, against the DHS to quash the subpoena

...and against AAMVA and the US Department of Transportation (DOT) to enjoin AAMVA from complying with the DOT’s parallel demand for the same data.

To me, this sounds a lot like DHS knew it's request is so dodgy - federal courts might grant a request to quash it. Filing a duplicate order from a different agency might have spread the request over 2 judges, doubling the odds of landing in one of the rubber-stampy courts.