I agree with the above summary.
In my view, this is a textbook example of when not to force the article's title into the lead.  "2011 Tucson shooting" isn't a widely accepted name for the incident.  (As noted in the GA review, there isn't even strong consensus to use it as the article's title.)  And unlike cases such as Inaugural games of the Flavian Amphitheatre, the phrase doesn't arise naturally when referring to the event.  (In normal speech, no one would state that "the 2011 Tucson shooting was a shooting that occurred near Tucson in 2011" or similar.)
WP:SBE explains the reasoning behind the guideline.  —