I don't like misinformation. This graphic is misinformation. Automatic weapons are legal (still a lot of paperwork), yes, if they were manufactured before 1986. Example: 1st column, 4th row. That's an FN P90; those didn't begin production until 1990. Therefore, its automatic variant is not legal for a civilian to own.
Now, why are "antique" machine guns legal, but newer ones aren't? No idea, but it makes them bloody expensive.
Edit: and wholly illegal in my (stupid) state. Sad, because I want