I'm Not a Lawyer, but...

The 5th Circuit Considers Whether the Trump Administration Was Legally Authorized To Ban Bump Stocks

...it would seem to me that the stake in the heart of this travesty would be West Virginia v. EPA as well as NYSRPA v. Bruen. Congress wrote the law defining what is or is not a machine gun. The BATFE shouldn't be able to change that definition on a Presidential or bureaucratic whim. That strikes me as the core of West Virginia v. EPA. Let's hope the court sees it that way too.