It doesn't make sense, but:
Suitable (ETOPS) = weather required
Adequate (to keep you non-ETOPS) = no weather required
At least that's the way it's written. So you could fly from the the Middle-East to UK, non-ETOPS, with every airport “weathered in”, as long as they were open.
Common-sense and airmanship apparently doesn’t have anything to do with it.
Good luck.