Ole, I think we're talking about two different things. The FBI warning message is malware that's been around for at least 5 years now. I've seen that thing on a number of people's computers that have called me for help. It's also fairly easy to remove.
The one in the article I posted, doesn't give you an FBI warning, and it apparently does encrypt files, otherwise the police department's IT people wouldn't have had an issue in solving it. The police department actually paid the ransom and it was released.
Of course that brings to mind many, many questions about how they run the computer network at that police department, but that's another story
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