Although I like the idea of comments in a stand-out color, red and green for deletion and insertion is absolutely necessary. It's intuitive and the standard, and using other colors (ugly tones of yellow and purple) is both ugly and confusing. If I showed the red/green screen to someone, they'd intuitively know what's being deleted and not. If I showed the purple/yellow screen to someone, they'd scratch their heads.

Also, the proposal that reviewers will determine whether or not to reject a patch based on how the colors look is preposterous. Imagine the Heartbleed patch being rejected because the colors look ugly. (This is, hilariously, the example the author uses.)