About a year ago (after the bomb guy), the STF installed movable (yet fixed) fences dividing the parking lot into two parts — one part accessible via the Eixo Monumental, the other via the S2. (permalink)
Hey Paulo, where did you see that info? I only saw it just now when I was looking at the comments on the map.
I passed by recently and didn’t happen to notice those railings there, but I’ll even try to swing by in the next few days to check.