- Schools weren't opened for most of the month
- Article is pushing an anti-gun agenda (not surprising for CBS)
What is glaringly omitted: how is a "school shooting" defined? The article mentioned some event that happened on campus (in the football field), which probably counts as a "school shooting" knowing the source of the data is an anti gun rights group. I wouldn't be surprised if the definition is quite broad so as to boost the stats.
So this is obvious narrative-pushing. But I might counter with, "See, this is a great reason to keep the schools closed. Look at the reduction in school shootings!" Which would fit right in with the level of discourse in American politics.
On a meta level, I'm genuinely curious how people's attitudes have changed throughout the COVID pandemic, not only about guns, but about homeschooling, privacy, surveillance, time with family, etc, etc.