Got an email saying access to TK lounges now included for cardholders. "Lounges can be used regardless of flight class and route" - doesn't say need to be flying TK but possibly implied.

One thing I don't understand is what are the "business lounges" that don't provide access, and how are they different from "TK's own lounges."

"Cardholders can only enter Turkish Airlines’ own lounges. Cardholders will not be able to enter business lounges, Star Alliance lounges, lounges operated by 3rd party companies and contracted lounges."