The article isn’t disingenuous but the title of the page is.
If these terrorist attacks had been accomplished the death toll would be much higher than the gun attacks.
Also, your points are true, thusly why I edited my comment.

Another point is that radicalized Canadians and Americans go overseas to seek training and to fight, knowing full well that domestic targets are harder than ever before. See the long list of Canadians going to Somalia to train with al-Shebab.

news.nationalpost.com

A half-dozen young Somali-Canadians followed in Hammami’s footsteps in 2009 and left Toronto to join Al Shabab, an al-Qaeda-linked group that is fighting to impose its harsh version of Islamic law on Somalis. At least one of them reportedly died soon after arriving.