The domain is still active. As it was registered 05-jan-2013 I would imagine the hosting was also setup at this date, which may simply mean that last week it was up for renewal and for some reason it wasnt processed.
Looks like the domain host has stopped serving that site. If you were a business revamping your site, you dont delete everything, you put a holding page up so that customers can contact you.
Could well be an admin oversight - happens all the time
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