Comes as zero surprise to me.
"The ATF suggests that braces intended to be fired without shouldering the gun may remain legal: “This rule does not affect ‘stabilizing braces’ that are objectively designed and intended as a ‘stabilizing brace’ for use by individuals with disabilities, and not for shouldering the weapon as a rifle. Such stabilizing braces are designed to conform to the arm and not as a buttstock. However, if the firearm with the ‘stabilizing brace’ is a short-barreled rifle, it needs to be registered within 120-days from the date of publication in the Federal Register.”"
So...basically..."Hey, quit with the cute crap building SBRs and acting like everybody doesn't know what you're doing, smarta**."