The article you link to indicates that AT&T plans to sell a *building*. There is no indication in the article that whoever buys the building in Atlanta, Georgia will gain control of anything else related to CNN.
The only thing in the article discussing the possible sale of something app related is them looking to unload Warner Bros. Interactive Entertainment video game division.
You are correct, I grabbed a link quickly from the many I found. Here's a better link with additional info:
https://forbes.ge/news/10047/Billionaire-Jeff-Bezos-looking-to-buy-CNN-from-ATT
