From the title, it looks like this piece of news reporting from Ars Technica is simply recycling a known fact: Bill Gates disagree with GPL. Read closely, however, you will find that he is speaking in the context that Bill Gates believe he could not had built Microsoft to what it is today with GPL.
That is a view that I shared. May be tomorrow we will see a big company whose portfolio is mainly GPLed software. However, given the circumstances Gates find himself in when he was building up Microsoft, I doubt he could built his empire with GPL.