It looks like the profile page has been updated recently, e.g. the community list is now different when it's empty:
However, two things are 'off' for unregistered users:
It seems like users are never shown as unregistered anymore. I've checked half a dozen spammers from Metasmoke records, those are usually unregistered, but the word "(unregistered)" is displayed for none of them. Update: I found an unregistered user on English Language & Usage. So this might be just a bad sample.
The link to the network profile is shown (example: this spammer)
However, that link gives a 404.
