How is this not an error?

The throw wasn't wild. It was just short. Online. With the threat of a runner scoring. But just short.

 

The bolded type only reinforce my thought that it's a fly ball with the runner advancing to third and then advancing to home on the throw. After reading the above portion, I'm almost willing to call it a sac fly with RBI because the ball was deep (almost a homer), the runner never stopped running from second (although he 'stuttered') and scored on a play that was still close, nonetheless.