Have I disputed this fact somewhere?
>The truth is, for a lot of numeric computing, you're better off using python, which calls fortran or c code to do the heavy lifting.
Proof that Python can't get the job done in that particular area. Nevertheless there remain Python zealots who will tell you that it's the best for everything.
>Fortran can run very fast. If all you need to do is numerical calculations, that might be enough.
Actually it sounds like that is all he needs to do. Reading and spitting out a .csv file from Fortran is trivial, despite its clunky IO syntax.