Check out this ladder. The curved railing along the top did not attach, and was unstable for use. It could technically be used as a support, but anyone expecting it to be sturdy might be in for a drop dead funny surprise.
You may consider reporting it as a potential safety hazard…staying away from codes altogether. Just a thought. 
If you feel the need to cite code then the 2018 International Building Code States
And the 2018 International Mechanical Code States:
thanks guys. just thought I’d run it by the forum real quick
Reading material here for you on fixed ladders.
https://continuingeducation.bnpmedia.com/courses/alaco-ladder-company/reaching-the-roof-specifying-fixed-access-aluminum-ladders-for-safety-and-efficiency/1/
The top of the ladder should have been secured to the parapet walls or the rails should of come back down and anchored to the roof edge.
