The Vox article? It wasn't though
My mistake, but still the opinion piece itself doesn't talk about the specifics of the most recent shooting, it's seems to be more on the general antipathy towards the issue in the political climate.
And even then, the sentence you pointed out
We have too many guns in this country,
In the writers opinion there are too many guns, in-general
including too many based on combat weapons,
Then they make a point of how many of the aforementioned guns are based on military designs
and as a result we have too many shootings and deaths.
And then goes on to state their opinion based on their earlier observations.