This is total bullshit, and won't likely hold up in court. It has been long established by precedent that pinning the "evil" adjustable stock renders it no longer an evil feature, and compliant with the ban. If by some stretch they do pull it off, though, it will open a huge can of worms for us in MA, once they catch wind of it. Let's face it, any item you alter to make it ban compliant can be reversed. Even cutting off the bayo lug would just require replacing the front gas block.
Pinned brake? Once again, a few minutes with a drill, or dremel, and you are back to a threaded barrel, but yet all of these things are currently accepted methods of converting these rifles in AWB compliance.