NEW ATF Pistol Brace rules are out: are they DEAD on arrival?!

So we have the new 293 page set of rules on how to classify pistol braces that I obtained minutes ago. But is it challengeable in court? If so how?

I will get a video up analyzing the new rules soon!

Link to ATF rules
https://www.atf.gov/rules-and-regulations/factoring-criteria-firearms-attached-stabilizing-braces

Cargill v. Garland Bump Stocks Video: https://www.youtube.com/watch?v=Iawi5c4zaks