By posting a list of “legal” weapons in the bill, you imply that anything not on the list is “illegal”, whether it’s mentioned in the bill or not.
They can imply whatever they want, which might have some political value, but if the law defines the features criminalized then the law says what it says (and they didn't even have to pass it for me to figure that one out!). All the implications in the world will have no legal weight (unless John Roberts is on the case).