There is a discussion on this topic on the Ducati forum I frequent too
The talk there is that he's a bike thief.
Here in Blighty the Police need a pretty good reason to raid your house and even bike theft, unless he has previous and is prolific would not warrant a police raid.
I don't know if he posted up the videos onto social media, I thought the police found them when they raided his gaff.
The reason for the sentence may be it was all they could pin him on.
If there is strong suspicion that he has other offences that cannot be successfully prosecuted, the courts will on occasion, give the offender what they can for the one offence they can prove. It's not meant to work that way but sometimes does, I've seen it in action.
Remember Al Capone?