I tried the blender demo here and it runs fast.
Then again, I can run GTA4 and Far Cry 2 fast in here so...
Anwyay, this technique in Construct will only work if the proyection that it uses is not ortographic. Also, someone would have to write that scary looking shader >_<
Oh that same guy had another blender demo with SSAO and it didn't work on my card Neither did his radial blur. I get sort of excited thinking what could SSAO bring to a 2.5d scene but then I also think of all the duplicate objects it would need :s