No, it doesn’t. That’s what I’m getting at. Look at how they define a machine gun in the act. It requires that the gun fire more than once per operation of the trigger (this is also what it means for a firearm to be automatic). A bump stock facilitates operating the trigger again more quickly, but does not fire more then once per operation of the trigger.

You’re not looking at the definition used in the law but deciding that anything that lets you shoot faster counts.