That was just a counter example and not a general proof of concept or whatever. I just saw it during my experiments and I was speaking about 64bit code itself - there is nearly no data included. I assume that also has to do with the AMD64 ABI where function parameters and results aren't pushed/popped to and from the stack but put into registers.
I know the statements done by AMD. The code will blow up, be faster, have more address room and so on.. Nothing new here. :)