What seems to be left out is that he knew that Ferrari were running an illegal flexible floor. When he brought this subject up he was told that they would continue to run this until it was discovered. This, together with his demotion, resulted in him passing text messages with race strategies to his friend Mike Coughlan.
He admitted sending information but when shown the documents he denied sending them. He also denied any sabotage, since it was supposedly putting a white powder in the tank (sugar?) which would have been well washed away by qualifying it seems an odd way to sabotage the car. His demotion and the sabotage accusation seemed very suspicious to me, it simply didn't add up.
Whistleblowing is not always allowed.