OSX has 26.2, Linux 21.7.
They sum to 100.1. There should be some inconsistent rounding somewhere.
If the figures are representative of reality it's true that Windows is less popular among developers than it is among the general public.
If 1% of the desktop users are developers, that's the same as 50% of the Linux users, and a really big share of the Linux users are developers (really, I expected it to be more than 50% what, clearly isn't true). That's also circa 12% of the Mac users, and I bet a biggest share of them are developers than the Windows ones.
That seems unlikely.
The fact that there are a number of programs without real non-Windows equivalents (games, emulators, various commercial packages) probably does suggest a lot of people doing Windows development.
It does certainly not mean that there are no Windows developer. That would just be repeating the same flawed argument, but twisted on the direction where it's the most flawed.
The people here on HN live in a bubble.
People are using Macs because it gives them a preconfigured and stable Linux like environment, almost 100% compatible with the server. Windows tend to have different toolings and different quirks. It doubles the effort. In my experience it's OK if you're using Java, which mostly hides the OS and it's obviously a must if you go with .NET. Basically only large companies use those two technologies, and not all of them. Everybody else is on scripting languages, JS, PHP, Python, Ruby. Btw, Java is almost always deployed to Linux too.
So, it could be a bubble but it's a large one.
Did you find any data relevant to that point?
I tend to think that it's true. There are more developers on Windows. Way more.