It is perhaps worth noting that only about 1/3 of US gun deaths are homicides. In some states, the fraction is much lower. For example, in Vermont, only about 1/10 of gun deaths are homicides. That's how it manages to miss this list but have the lowest rate of gun homicides in the country.
Yeah, the title of the quiz is about gun "violence" I wonder if the source he used includes suicides or not, if it were just gun violence then he'd have to exclude gun suicides.