“It looks to me like this was planned with the purpose of a lawsuit.”
You are in total error. His name was picked at random after everyone was boarded, and he had nothing to do with his name being selected; ergo he could not have been planning a lawsuit when he boarded.
You are partially correct. His name was chosen at random and he had been peacefully removed from the plane. However, he got back on (somehow, perhaps with his boarding pass) and was recorded by the passenger behind him talking with his lawyer as they were coming for him. The news is not giving you the whole story.