I never saw anything to suggest that it was, so I believe it simply makes them feel good. Also, undisclosed location is very suspect. How long will it take to traceroute it and find the nearest Level3/other major company node's location, therefore the probable location of Sony's servers.
Of course, to your average user "we've moved the datacenter to prevent attacks" looks pretty good.
I fail to see importance of most steps that are outlined in the article. Things like "Implementation of additional firewalls" are just technobabble for their fans: "Look, we are doing something!"
Of course, to your average user "we've moved the datacenter to prevent attacks" looks pretty good.