That study is a joke. They look at gun violence stats based on age and just extrapolate that and make assumptions about its implications on college campuses.

They do not (for obvious reasons) look at data from the campuses in states where campus carry is already allowed...

Another hilarious move is the footnote where they (dishonestly) "support" their claim about gun-free zones not facilitating mass shootings. All the examples they use except one of shootings in gun-allowing zones are in states with restrictive gun laws to begin with...