Here is what it says in the FAQ section of that website:
The site is not affiliated with google in any way.Alex and Erty were chatting on Google Talk one night, and Erty wondered if Googlegoogle.com was taken. He jokingly wondered if they could set up a search service for Google itself. Unfortunately, Googlegoogle.com was taken, but Alex pointed out that GoogleGoogleGooglegoogle.com was available. In a impulse buy, they purchased the domain (Alex already had some hosting) and someone had the idea of putting four Googles on the page. Thus, GoogleGoogleGoogleGoogle was born.