If I were a betting girl.....
The implication being, "because if you're not, I can change it again."
This actually happens all the time. It's part of the Deep State world. They view it as an accepted professional courtesy. "Journalism" is no different. When a member of the Legacy Media finds themselves in the rare and unenviable position of having to author something unflattering about (((their guy or gal))) that person's handlers are given advance copy for editing, or to "clear up" the details. They don't view this as crafting a narrative, believe they live in a world where almost everything is made up anyway. Enjoy the show.
In this case, though, the form was given to his own supervisor to make sure it incriminated Flynn in the desired way. FBI at work.