read the whole article:
"Viggo’s immediate answer to the question is ‘No.’ He was NOT asked to take part. Secondly, he was asked in 2008, when The Hobbit screenplay and pre-production was in its most early stages. The producer who asked the question probably asked the same to every single LOTR cast member to gage the writing team’s options for the script."

Bullshit, read this article:
http://www.theonering.net/torwp/2013/05/30/72294-viggo-turned-down-role-as-aragorn-not-so-fast/