Are you so reassuring for the owner to recover if he sends the video, and everyone is sure that the moderators will agree with his evidence?
No, not al all. I even mentioned in one of my posts that all the information he provides can be in vain and might not be accepted. But what else can a person provide who has no signed message on the forum and can't access his email. An email saying 'Hi, I am Gaasty and this is my screenshot', will surely not get the job done.
But his email address was not shown on his profile...
You can make your email address visible or hidden to the public through the settings. But when you are logged in, you will always be able to see your email in your profile. Whoever accessed the account, could have taken a look.