Don´t get me wrong i´m absolutly on your side and like i said there are some edges (like the ones that build the rectangle) all ED AA modes aren´t working. Just a higher resolution can make it better (also not perfect).Yes jaggyness was reduced by 33% at best.
While most other titles achieve the result of 2x with AA without the 2x
But to say there is absolulty no difference between AA off and on isn´t correct. Some edges are really good anti aliaised see the handrail.
So finally just a FDev Tec could explain why this happens and maybe solve the issue but i think they have a lot other issues at the moment...