If you read it carefully it's not just about piracy. It's against sharing (which in open source happens without any piracy). His basic idea - sharing prevents good software from being written. I.e. only closed paid model can be incentive to create good software. It's the cornerstone idea of Microsoft and is very in line with their historic hatred towards open technologies which they always saw as a threat (and obviously not because of piracy). It also is in line with their aggressive approach to enforcing patents and copyrights.