not true.
Naser Hejazi ( bangeladesh and Czech Republic-or was it Slovakia?)
Ghasempour, heshmat mohajerani, pour heydari , ( not sure) roshan in southern Persian gulf states, jalal talebi ( Syria)
And many in youth level
Most notably
Mahdavikia in Germany
And Hasan Nazari doing marvelous work in his Academy in Texas
nouri and ghotbi don’t count! They didn’t develop in Iran!