0-systems.com needs some serious seo help

I first came across this 0-systems.com site because I noticed they used to resell my content.... I asked them to stop and they did... I think. They have to be spending a lot of money on Google Adwords and Yahoo Search Marketing because I ALWAYS see there ads. This site is not new by any means.... I gotta wonder where they got there seo advice from. Better yet how are they even in the google index? Literally 1/2 of there site is hidden text... and its not even like its small hidden text.. blah blah blah hilarious.