Unfortunately I am unable to view the video although I can hear the sound track to it! I am therefore not able to comment on it
Just because your rooster recovered, does not mean he does not have Marek's. I have had several birds completely recover from Marek's outbreaks after a few days or weeks, so that you would never know they have been incapacitated or there was anything wrong with them, but the virus has just gone into a dormant phase and they will be prone to future attacks at times of stress which could be weeks, months or even years later.