Elsewhere the (singlehanded) author explains his reliance upon Mac frameworks and his lack of resources necessary to develop on other platforms. I believe every tradesman has a right to choose his preferred tools and platforms to support.
Ironically, you should read the comments from your own example as they descend into debate regarding these very options:
https://news.ycombinator.com/item?id=14453252
And what's really amusing is that you've now missed this point twice in a two day period.