really? I wouldn't be surprised, just I never noticed it and it hasn't been enforced.

I've definitely taken a guest in to the F lounge recently who was not flying on CX/KA. He was on United. I'm DM. According to these updated rules - which I was totally clueless on, I thought I could bring anyone in (I've brought in an airport staff before) - he shouldn't have been allowed in. In reality they just waved him through when I gave the lounge card.