Well they aren't really 2nd amendment are they? He's just following what his staff tell him . He doesn't have a clue about them except from in a movie.
You don't need to take his word for it.Well the Supreme Court won't rule on if the 2nd amendment covers silencers so I will take your word on that. https://www.dailysignal.com/2019/06/10/the-supreme-court-wont-decide-if-the-second-amendment-covers-gun-silencers/