That's not what pageouts as reported by OS X refer to. Try the following experiment:

  1) Open two Terminal windows.
  2) Run top in one of them.
  3) Note the pageout number.
  4) In the other, type echo foo > bar.txt
  5) Refer again to pageout number.

You will see that it did not increase, even though the system just wrote to a file. This will be the case even if you wait a while.

On OS X, the reported pageouts are dirty memory pages being tossed, not writes of files to the filesytem.

Your definition also does not match the historical distinction between swapping and paging and the distinction you draw is idiosyncratic. Originally, swapping referred to swapping out all of a process's memory, while paging is done in chunks. No system has true "swap" in this original sense any more, so the terms "swap" and "page" are now basically interchangeable.