How do you know those Mullahs were Wahhais? They could well be Shiites from Iraq or Lebanon.
He does not know,
The non-Persian speaking Arabs could have been Shia Arabs from Iraq, like those Shia Militias in Iraq that the Mullahs in Tehran backed. Those Shia in Iraq opposed Saddam on two grounds - the Shia not the Sunni in Iraq were and are the majority in Iraq, and Saddam was a Sunni.
His only evidence is a supposed Iranian ex-pat who claims Komeini brought Wahabis into Iran - because he witnessed non-Persian speaking Arabs in northern Iran near the border with Russia that he claimed were working for Komeini. End of evidence.