Reports are rumors, nothing more.
And I don't need any article. If you understand what was said in the article you linked to, you'd understand it.
The article was written Dec 20th. At that time, the Cowboys were going to be over the cap for the new league year starting in March of 2017.
By rule, teams have to be cap compliant the night before the league year starts. The article assumed that in order to get cap compliant they would have to dump Romo. The only way to get cap savings by that time was cut Romo. If they traded him before the league year started, it wouldn't be processed until after the league year started. In fact, the article you linked explains this and said if they don't cut Romo they will have to restructure deals to get in compliance.
The Cowboys restructured Smith and Frederick so they will be cap compliant by the eve of the new league year. Therefore they no longer need Romo's cap savings now before that date.