He's been lying all the time and he can't be trusted.
So you can just ~ him. suchmoon has already given him negative feedback for this. Is leaving mass negative feedbacks for the same thing not an abuse?
It's not an abuse to give mass negative if it's a proven scammer, sometimes it's better to do so as the DT network is very dynamic now and the feedbacks can jump between trusted and untrusted after monthly DT1 updates by theymos.