The point of the poster's post, and its headline wording, is to refute the message of the few hours this afternoon from the MSM that "there was no political bias" in the IG report. The double-negative is important to the meaning.
Media: "There was was no political bias."
Poster: "The report did not say there was no political bias."
Thank you for confirming the language in my headline. oYou are exactly right.