There's a link on the Blaze article that goes to the google cache of yesterday's Fox News report from Todd Starnes (that Fox subsequently scrubbed). Starnes reported that "A source close to the investigation revealed that Abdul Rahman Ali Alharbi had been deemed inadmissible under the section of the Immigration and Nationality Act which declares ineligible for a visa any alien who is engaged in or is likely to engage after entry in terrorist activity."
So, according to Fox News (before they pulled the article), the Saudi was ineligible for a visa due to possible terrorist involvement. That is apparently unrelated to the 212-3B deportation designation.
I think I remember Glenn saying yesterday that the Saudi was ineligible for a visa, was given one anyway, but that he was supposed to remain in Findlay, Ohio. It was after the bombing that the FBI discovered he had an apartment in Boston.
Maybe Glenn said more about all this today, including what you've mentioned about Canada. Maybe someone else who listens to his show can fill in some blanks.
A screen grab of Starnes’s article is available here: