Iran is a signatory but not (yet) a party to the Rome Statute, and as such the ICC does not have jurisdiction in Iran unless explicitly given by Iran (similar to what Ukraine did following the Russian invasion). Palestine is a member, so crimes against humanity committed in the occupied territories are under the jurisdiction of the ICC.

Don’t get me wrong. The Iranian government absolutely should go straight to the Hague for their crimes against the Iranian people. But this whataboutism does not dissolve the crimes of others.