Am I the only one always confused by memes like these?

No. It’s pretty inside baseball.

Joint Statement of the Communist Parties of Iran (TUDEH), Israel (CPI) and the U.S. (CPUSA)

I don’t see how OP can characterize it the way he did, though. I thought the critical part if their critical support was fairly mild, though I’d have gone for something even more mild.

In the yoke of tyranny and the current dictatorship

There is no critical support in there. Just some fence sitting. Also "Communist Party of Israel" now that's a puke.

They're endorsing the mainstream narrative of the Iranian government being uniquely tyrannical and a dictatorship with no context, rather than a flawed government that formed under decades of imperialist siege, which is what I'd stress as an ML. They could be debunking the bs claims going around, but instead simply call it a dictatorship. Idk, it's a lackluster statement from people who claim to be comrades.

Okay but why is the statement from an ML party worse than even DSA’s statement?

https://www.dsausa.org/statements/dsa-stands-against-imperialist-war-and-with-the-iranian-people/

I don’t know much about them, so I’m not qualified to say. PSL’s statement doesn’t make the same mistake.