Still FALSE.
You are correct. But there is something about murdering children, so that is a notable part of the scenario.
https://www.cnn.com/videos/us/2022/05/25/deadliest-k12-school-shootings-us-lon-orig-jk-tp.cnn
Most articles I have seen specified k-12 schools, and if you count only the students it is the deadliest.