It's a valid argument. al-Sadr recently spent a significant amount of time in Iran, according to about half the news sources (with the other half focusing on Iran denying al-Sadr was there). He wants to be a ligitimate Shi'ite leader, and is a rival to al-Sistani, who has had strong backing from Iran, so it'd be natural for al-Sadr to seek to draw Iranian support from Iran as well.
His army is the exact type of people Iran has been supporting as well (according to intelligence reports), so it's also not out of reach that they'd try to work with him as well.
As far as I know, there's no proof, but it certainly is beyond the realm of "simply not true."

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