I get what you're saying but you're also being incredibly dismissive to the common understanding which is still correct, otherwise most astrophysics wouldn't work, because it wouldn't be possible to predict where another planet will be at a later time. It's possible to have two alarm clocks go off at the same instant on two planets, though obviously each will observe the other going off later, after a delay.

It's obviously fair to say they happened at the same time in this scenario.