I don't see where the assertion of being entitled to lounge access arises. Holding One World Sapphire status provides for benefits when travelling on a flight which is both marketed by and operated by a One World airline

QF codeshare on an EK flight is marketed by One World, but operated by a non OW carrier

Having three threads on 1 quesiton seems unnecessary - the question has been addressed by more than 1 person at the 1st thread https://www.flyertalk.com/forum/brit...need-more.html