You might be on to something there, it could be an intermediate server causing the problem, but I believe the reason different users are seeing this at different times is DNS TTL.
The message appears to be from the FlashBack malware.
If the SatelliteGuys servers have been checked out and there is no evidence that the malware is currently loaded on the servers, a mis/poorly configure DNS server/router somewhere totally outside of Scott's control could still be caching bad data by not expiring DNS records properly.
As a user, I can flush my local DNS as much as I want, but if I keep hitting a bad record somewhere out on the web there is nothing Scott on the server end, or any of us on the client end, can do.
It could actually be our own local ISPs, or a TTL value somewhere else that is being propagated.