This hardline/moderate is a myth at least for last 15 years. However, the Iran lobbyist (e.g. NIAC) keep this narrative alive. Even in the 2000s era, the crack in the structure were minor. The so called moderator didn't had the motivation to really change anything substantial. It turns out they just wanted to use the people vote as a bargain to re-incorporate them into power (that fraction was in power in 80s but then kicked out). The regime is pure hardliner bcz this is a regime that the whole power has been consolidated under the hand of supreme leader (and this is why people in the streets called him dictator). The parliament/president and the election is just a joke! A show! They've re-define almost any word and void it from meaning.

The Supreme Ayatollah has a flexible user interface (UI) for the "West". When he wants to retreats: It wears the so called moderate president (Khatami, Rohani) and when the business is as usual he shows his teeth (Ahmadinejad, Raisi). The so called "president" is a joke. The last one (Raisi) has basically no self-agency, he is all ears for his leader and openly is proud about it! The previous ones weren't much different but at least they put up a show or a fuss when they told to do something. But this last one is perfect pawn (A soldier of leader as he puts it): "Sarbaze Velayat". The show was such a joke that in the last presidential selection: The supreme leader even eliminated his own long time friends and allies such as Larijani* and played Qalibaf to reduce the chance of any uncertainty (+). Note even with those eliminated in the run, it was still selection between potato vs potato...

* https://en.wikipedia.org/wiki/National_Iranian_American_Coun...

* https://en.wikipedia.org/wiki/Ali_Larijani

* https://en.wikipedia.org/wiki/Mohammad_Bagher_Ghalibaf

+ Uncertainty because previously people have tried to select the least favorable one for the grand Ayatollah, this time he didn't want to tolerate even that level of surprise! He has no fun!