Haven’t seen that article, but it could be roadblocks were set out of line of site of the facility. most articles indicate there wasn’t much going on visibly except the note of Libyans taking photos. After the ambassador escorted the turk out he gate he went back to his residence. At some point people noted there was what looked like a wedding going on down the street.
I will look for the article. I remember it because the Turk would have had to pass through them. Assuming the article info is accurate (big assumption), I had wondered at the time why the turk didn’t warn Stevens about it.