No evidence because its the ranting of a conspiracy theorist, an ignoramus or most likely some YouTuber wanting clicks. Possibly such an idiot would be all three.
Rule 2021R-08F became effective on January 31, 2023, the date it was published in the Federal Register. If the firearm with the “stabilizing brace” is a short-barreled rifle, affected person have 120 days from the date of publication to register the firearm tax-free, which is May 31, 2023.
That's not a trap because people aren't being asked to document their illegal possession as ATF gives clear, easy to understand options on how to register tax free that SBR. The rule clearly gives a 90 day window to file that special Form 1 nor take advantage of their other options under this rule.
Again, any idiot saying "pistol brace amnesty registration might be an ATF trap to get people to document their possession of an illegal SBR" hasn't actually read the rule. Likely has never heard of entrapment and doesn't understand how tax free NFA forms work.