That true. They could've simply linked to the IE9 download page.
But I think MS's algorithm would have de-ranked the site because any IR algorithm considers the content of the page too - if the web page served to IE users is about redirecting to browser download pages, their crawler (which may identify itself as IE) might not consider it to be the best result about 'Kogan'.
But I think MS's algorithm would have de-ranked the site because any IR algorithm considers the content of the page too - if the web page served to IE users is about redirecting to browser download pages, their crawler (which may identify itself as IE) might not consider it to be the best result about 'Kogan'.