The page you linked says "Attack type: Double tap missile strike"

Edit: it also explicitly says "double tap" under "Events" and links to the article for "Double-tap strike"

I don't think a third strike is confirmed, but I also think "double-tap" is more of a category meaning "followup strikes to hit responders" so I wouldn't be surprised if 2 followup strikes instead of 1 are still categorized as a "double-tap strike". It seems like splitting hairs either way. We know that the strike caused surviving teachers/students to congregate in a prayer hall. 40 minutes later that was hit as well killing almost everyone

Page has been edited after my comment and changed from triple to double tap, and now they had to protect the page from vandalism.