That article is very short on facts, so much speculation. It is incredible that Paramount let Sheridan go. As the article says he was the content creator for Paramounnt+.
I do think that they article is correct in speculating that Paramount figures they already own the rights to his big hits and Sheridan is tapped out.
Personally I am bewildered by his success. Everything I have seen of his since Wind River is absolute garbage. Though I have to admit I have never bothered to watch any of Landman.