I don't exactly know, where the problem is.
Eyerything is simple, as long as people are able to read and understand terms and conditions or the fineprint:

Continental Airlines Presidents Club®, Delta Crown Room Club®, and Northwest Airlines WorldClubs® locations worldwide can be entered, when traveling with the respective airline that is operating the flight.
The Platinum Card member must have their Card on their person and present it to the club agent along with an airline ticket valid for travel that day on the corresponding airline that is operating the flight


Other lounges that can be entered by showing your Platinum Card and any valid same day boarding pass:

Europe:

Vienna - Grande Danube Lounge.

Africa / Middle East:

Bahrain - Delmon Lounge.
Egypt - Cairo - EAS Lounge.
Jordan - Amman - First Class Lounge.
Lebanon - Beirut - Cedars Lounge.
Oman - Masqat - Business/Executive Lounge.
Saudi Arabia - Jiddah - Oasis Lounge.
Syria - Damascus - Executive Lounge.
United Arab Emirates - Abu Dhabi - First Class Lounge.
United Arab Emirates - Dubai - Marhaba Lounge

Carribeans / Latin America:

Barbados - Bridgetown - Club Caribbean.
Mexico - Mexico City - Club Centurion.
Puerto Rico - San Juan - VIP Escort Lounge.

South America:

Argentina - Buenos Aires - Centurion Lounge.
Brazil - São Paulo - Centurion Lounge.
Ecuador - Guayaquil - Centurion Lounge.
Ecuador - Quito - Centurion Lounge.