Of course they don't but some of them include traditional mils (clubs) in their training program. I know also non-Iranian international wrestlers who do exercises with Iranian clubs.
On another note, some Iranian freestyle wrestlers practice also the traditional style and they participate in competitions. The HWT Fardin Masoumi was the 2007 national champ in traditional wrestling. Three weeks back, there was a special presentation of Zurkhane exercises attended by highest Iranian politicians, incl. their notorious president:
Ahmadinejad awarded Masoumi a figure in the shape of a wrestler exercising with an ?iron bow?.