Didn’t say it was exclusive to Boeing, just said Boeing had the certification.
That's what you wrote giving the impression that ETOPS is exclusive to Boeing which it isn't.
You also wrote:
I believe only Boeing 767/777 are okd for o/s flights of over three hours.
and
They only use the four engine jobs on o/s flights of long duration.
and
says that it can go 180 minutes without engines to the nearest airport three hours away.
which are also incorrect.
Please explain how a 767/777 could fly 180 minutes without "engines"?