Missing key points:
Why is this administration, which is all for coal, oil, and against environmental policies pursuing THIS?
This DOJ is all about pursuing cases for retribution. It could be, they already know someone they want to punish, and already found they're using the device. Or, use it as a source for finding people they want to punish.
It’s not about this administration. The lawsuit was filed in 2021.
US Attorneys aren't forced to toe the party line on every issue.
This issue is just not directly politically important enough to get the "don't touch" treatment.
Donors and party power brokers aren't rolling coal.
Also strange as it would disproportionately affect modified diesel trucks, who are overwhelmingly Trump supporters.