He's referring to the accusation that Uber employees are deliberately ordering and then, shortly afterwards, cancelling rides with competitors' services in order to screw with the dispatch system and waste the drivers' time.
This has been throughly debunked. Those cancellations were apparently by Lyft drivers who also drove for Uber, and they were trying to recruit more people to drive for Uber. But the 5k cancellations end up being less than one cancellation for every 5 days per Lyft city (in other words a non-factor). Lyft asked Uber to acquire them (presumably because Lyft is burning cash and is on the way out), Uber balked so Lyft started slinging mud. What's more, Lyft has apparently been engagaged in the exact same tactics. http://www.vox.com/2014/8/27/6074919/the-uber-recruitment-sc...