That's largely how I read it. Or maybe I would have called it a warning "shout". But I don't think it's just about him.
He's obviously p.o.'d at Harlow and, I think, others who have been spreading their version of events.
But previous experience with how the MSM develops stories tells me there's something else he's mad about. I'd bet he's been seeing "anonymous sources" quoted in articles...and he recognizes them and what kind of pre-spin they are trying to insert into the story.
He's letting them know he's keeping track . He's put them (and any others who might try it) on notice: lie to the public or to the grand jury and Novak will hang you out to dry.
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I have previously said that I never would have written those sentences if Harlow, then-CIA Director George Tenet or anybody else from the Agency had told me that Valerie Plame Wilson's disclosure would endanger herself or anybody...........
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I read that as, Novak talked to a lot of people and no one feared using Ms. Plame in the story would bring harm to her.