I'd say that's a better guess than most. It could also be a combination of 10-20 people condensed into one op-ed. In other words a pure fabrication that didn't come from anyone in the WH.
I just don’t see any more solid evidence pointing to anyone else than the proximity in time to the reputation-be-damned hire of Jeong and the production of this new flavor of propaganda item.
New hire comes with new idea, very straightforward, and nothing at all in this narrative contradicts the ideology and character of the individuals under discussion.