Carter Page has already been identified as an FBI asset who was worked to build cases against Russians in the past. He's already been "outed," in other words.
Another thing against it being Page, Kimberly refers to him in the usual manner in the article:
“the FBI played dirty with its surveillance warrant against Carter Page, failing to tell the Foreign Intelligence Surveillance Court that its supporting information came from the Hillary Clinton campaign.”
If she thought Page was in on it, would she use the usual victim characterization?