I'm pretty sure this is aimed at websites that have a "download" or "get x now" link on their website that just takes you to a git hub page with no obvious download section. It isn't uncommon, and it can be frustrating. At the very least, it's a bad user experience.

The medium internet user doesn't even know what git is, so I think it is very likely that a lot of people don't understand the way github works and are very upset by how "difficult" it can be to get an installer from it.