Your reference talks about one state (Utah). Even if Housing First was successful there, that doesn't mean it was successful anywhere else.

Also, the definition of "success" in the article you reference is that a person gets into housing provided by Housing First. But the article under discussion in this thread is not saying that doesn't happen. It's saying that getting into housing provided by Housing First doesn't necessarily improve the lives of the people--the author describes "Massive drug use, fights, assaults, despair and death" in a Housing First building. So your definition of "success" seems to be different (and less stringent) than the author's.