regards to theymos' comment that controversial ratings should carry an actual risk/cost by way of a retaliatory rating, and there does not appear to be any risk/cost to suchmoon in this case.
There is nothing particularly controversial about this rating
Except the fact that you admit you don't have evidence beyond speculation to support your claim against the OP.
It looks to me that your rating was more intended to protect a position of power, and was less so about warning others about a potential scammer.