Not "Breaking News" and not a "reversal".
The ATF never said that unintentional misuse by accidentally firing a round while inadvertently having the stock touch your shoulder was considered "re-designing".
If you've read the open letter, you'll notice the reason for it's writing:
"However, ATF has received numerous inquiries regarding alternate uses for this device, including use as a shoulder stock." (not accidental misuse)
The only reason the ATF wrote the letter was to clarify, to the asshats writing letters, that:
"Any person who intends to use a handgun stabilizing brace as a shoulder stock on a pistol (having a rifled barrel under 16 inches in length or a smooth bore firearm with a barrel under 18 inches in length) must first file an ATF Form 1 and pay the applicable tax because the resulting firearm will be subject to all provisions of the NFA."
The only "Breaking News" is that the more letters you write to the ATF, the more letters they're going to write to all of us.
STOP WRITING LETTERS TO THE ATF!!