Thats a good one but I would have to guess that the place you are talking about here would not fall under 9.41.300 until 9pm. That is when it becomes off limits to persons under 21 as classified by the state liquor control board. It would be treated as a restaurant until the point in time when persons under 21 must leave.
I could not find any info on the liquor control boards site that even referances this type of establishment. I guess we can chalk up another poorly written law.