Sounds like it operates like a bump stock with a return spring installed in it. We already knew those were illegal.Following the law is not a loophole. Looking for ways to circumvent the obvious intent of the law is not following the law and that is pretty much the definition of a loophole.
The obvious intent of the law is that they don't want people to shoot fast. Pulling the trigger fast is a loophole.
It's not a result of people finding loopholes. It's a result of the government passing feel good arbitrary laws with arbitrary lines drawn.
There's a lot of people out there who see semiautomatic AR-15s as a loophole that allows you to own an M-16.
"Loophole" is just a name for whatever stupid law you want to pass next.