Noone would be remotely surprised if Iran attacked a nominally American target, so it's puzzling why the Iranians would talk about it instead of just doing it. They would also need to be careful not to cross the line between pressuring friends of the US administration to lean on Washington and pushing so hard that those friends double down on their commitment to the US. It's not like the Gulf states are simpatico with Iran after all, they might think for example that the Shia worldview is vaguely heretical and wacky anyway so why should they not let the US shoot at them.
You are puzzled why Iran threatens the destruction of assets of powerful American oligarchs if policy changes aren't made? Allow me to point out that political leaders rely on the patronage those oligarchs and are strongly incentivized to do what they say.
Its exactly the right play for Iran to threaten but not do and hope that corporate greed panic does the work for them.
