Seems obvious that JD Vance or a close aide is a key anonymous source for this NY Times story. Vance apparently wants NYT to help him create the impression he's blameless in the war. Note that NYT does not say Vance declined comment. Surely he was contacted, considering the story is all about him.
Behind the Scenes, Vance Gathered Unvarnished Views of the Iran War (Gift Article)
Vice President JD Vance received sobering assessments about the war that did not line up with what he, President Trump and other top administration officials were saying publicly.
nytimes.com