First off it was the price for a $1 DD, and so while a bit short it was an odds on horse in the second leg so not at all unusual.
For the conspiracy minded, I watched the replay at TwinSpires and what struck me was that for the 9th race they literally had like 7 minutes of pre-race video, and not one second after they passed the finish line. In my experience, most times the replay starts as the horses get rolling coming to the top of the stretch, include the jog back to the winners circle and the photo with the nice graphic about the connections, and include the replay as well as the head on replay. The other races that I checked last night followed that pattern but the 9th race did not. Further, the replay usually notes the inquiry and shows the video footage of the infraction.
Not sure what happened with the infraction. Did note that the Yonkers Raceway replay site did not include an option for anything other than the pan view of any of the available races from this week, so any proof there was an incident caused by the winner is not available as far as I can tell.