Max had barely touched the surface of the issue. He still had a lot to reveal. His Boss had provided him a lot of information, and he had to justice to all of it. Max did not stop at the City Central Hospital. He revealed all the hospitals in the list he had, providing sufficient pieces of evidence to support his claim.
There was no way the hospital or its management could refute their involvement after watching the video clips. Even without any video authentication, it was easy to deduce that all the clips were not fake or that they had been altered, and the content they were playing had happened in real.