That's pure speculation, but I can't think of any other useful outcome of doing such attack at this point.
However those in Iran seem to go for maximum impact.
I suspect they're different actors.
Short of hampering Iran's nuclear capability, there's not much motive left under Biden. As a country we're just slowly ceasing to care.
All of Iran's other rivals in the middle east are lacking in said capabilities, and China and Russia tacitly support Iran.
These are most likely just trial probing runs. Iranian gas stations use government networks for payments using a card issued to citizens for the subsidy. It's just a hop skip and a jump from there to critical military and other strategic infrastructure.
Stuxnet worked because it was subtle. This doesn't fit that pattern at all. Granted it could be a probing-run gone wrong.
https://www.jpost.com/breaking-news/hillel-yaffe-hospital-ta...
Assuming a particular attribution, it wouldn't be fantasy to assume this is payback. Or it could be anything else. For all we know, the regime has a fuel shortage and wants to cover it up with a 'cyber attack'.
I’m not sure there’s enough evidence in this case to implicate anyone, including the US, but I don’t think they can be ruled out simply on the argument you’ve presented.