That's what I've always done, just used the pressure washer carefully. Avoided concentrated direct spray on the electronics, brake reservoir etc and started it up right after so the heat can dry. Never a problem
Maybe a FGC is more sensitive, but all engines are made to get wet to some extent
That being said, the guy didn't even take his stuff out of the car. Always puzzles me why people don't spend a couple hours and give a vehicle even a light cleaning before taking photos, it at least gives the impression they cared about the vehicle