Because, for one thing, there is a vastly different market value between any candidate and a candidate who you want to work with you. And the market for locums and the market for new hires are not the same thing. No doubt there are quite a few who overlap but the locums market does not typically include people looking for their first job, unless they are insane or it is a very restricted type of locums (like an in-office lab with only one type of specimen).
Just because there is a disconnect in what you are reading does not mean someone is lying or delusional. What is true is that groups (and hospitals) will have vastly different standards about who they are willing to hire. That I am positive about.