I don't think so. Until we tell them otherwise, they think they are all black rifles. They didn't know a pistol from a rifle until we tell them.
They may well hate black rifles, but just ask an anti-gunner to define an AR pistol. They can't do it.
They don't need to be able to define different features. They know if it's popular they can try to ban it. Here is an article about a bill to ban braces from back in January 2019. I'm sure you can find examples of house bills that were introduced well before last year.
DEMS INTRODUCE NEW FEDERAL 'ASSAULT WEAPON' BAN THAT INCLUDES PISTOL BRACES