On what do you base this statement? It is patently untrue.
Many private pre-schools have excellent pre-k programs that do a far better job than public pre-k schools in preparing children for kindergarten (public or otherwise). My wife is the director of one of these fine schools, and she will put her results up against any public program.
You seem to share the same bias as the reporter of this story.
I think you missed my point.
Certainly I'd rather put a child in a private school that any public (government) school. But is your wife's school designed to prepare children for public school?