I couldn’t really tell you that Apple TV itself is biased towards Israel in any way. The show Tehran shows both Mossad and the IRGC as pretty horrible organizations, with Mossad even being shown as slightly worse.

So without knowing anything about the show other than a few people involved and a trailer. For all we know, maybe the protagonist was actually betrayed by the IDF?

If we have literally no idea what the show’s about, we can’t really call it propaganda. You can watch it without immediately becoming a zionist, if you want to make up your own mind on what it is.