I would say it's truthful. I'm not convinced there is such a thing as manipulative language - the speaker is manipulative not the words - it's not hypnosis.
And manipulators are prone to accuse their victims of their negative traits.
It depends on what actual "truth" you're referring to. The only actual fact brought forth in the article was Trump's order to the DOJ to investigate as to whether or not the FBI put a spy into his political campaign. That, in and of itself, does not constitute an accusation, nor does it prove wrongdoing on anyone's part. It's just an investigation; it's no big deal - hardly worthy of such a gross overreaction.
The rest of the article is nothing more than opinionated invective spread on so thick you can cut it with a knife.
The manipulation comes in when the writer suggests that it's "despicable" (or even "dangerous") to dare to question the "integrity" of the Justice Department, the FBI, or any other agency in our government. As if we're supposed to believe that they ever had any integrity in the first place.
It appears the Ivy League lawyer is more interested in protecting the puffed-up egos and reputations of his peers more than anything else.