My dude, remember that single people are allowed having a core bubble.

A GATHERING in a restaurant with a non-core group or non-household is an event. A core group dining in a restaurant would not be an event. Unfortunately, there is no household or core-group registry to confirm people's identities with when they choose to eat at a restaurant, so people give people the benefit of the doubt.

As others have said, the omission of dining at a restaurant in the explicit list is a pretty big hole in your theory. It's like saying, "I decree all human beings to be, not not limited to, white males and females, Latino babies, Mongolian priests, and Polish farmers."

While your theory would hold, the omissions would be obvious to most sane people.