Why not just claim they eat babies or something equally horrific?
They do publish many horrific claims.
gets the same results in the end
No it doesn’t. When your outlet is obvious propaganda, fewer people believe you. RFA’s sheen of reputability was a huge factor in the haircut story’s enormous reach in western media.
Hire a bunch of hatchet job propagandists
…the sort of people who would write this disproven haircut story and dozens of other goofy unsourced claims they’ve published, yes. You can even tell them to write normal stories too just to mix it up.
Convincing journalists to lie seems like a lot of work
Not if some or all of your journalists are US intelligence — Radio Free Asia began as a CIA front operation (google it), and might still be one.