

He’s saying that the US is responsible for the Ayatollahs being in power (even though that wasn’t the intent) because they installed the Shah who the people didn’t want the but was friendly to US interests.
So I think it’s accurate to say that the US unintentionally ushered the current regime into power by putting in an unpopular puppet dictator to replace an elected leader who was popular with his people (Mossadegh).

Iran elects popular leader who wants oil revenue to benefit his people instead of foreign interests -> US installs the Shah who is unpopular but friendly to US oil interests -> Iranian revolution of 1979 installs the current regime.
And your solution to this is… more regime change? Shouldn’t the US have learned a lesson?
Maybe a more recent lesson would make more sense?
Iraq regime is unfriendly to the US - US takes out Saddam’s regime -> Rise of ISIS -> US has a huge mess to clean up now in both Iraq and Syria -> forever war continues.
At what point do we admit that US interventions probably aren’t a good idea?