> zero chance they can make a brand new, high output jet engine in one year

Not one year. "produced by EOY '25" means they're almost certainly already very far along in the development process. There's no way they'd have a target date that early if they hadn't even started yet.

Looks like this article from last year says they were already doing hardware testing back then: https://boomsupersonic.com/flyby/boom-supersonic-accelerates...

That said, as with any other aerospace project, I expect delays.