The fact that it lists Minix as an OS choice but not (say) Fedora makes me wonder if it's supposed to be a joke, but if so it's way too subtle for me.
Minix 3 isn't (intended to be) a joke. It's supposed to be a reliable, self-healing, UNIX-like operating system.
I understand that, but placing it on a "what OS do you use daily to develop with" while leaving out far more popular OSes gives a distinct "it's a pretty obscure OS; you probably haven't heard of it" hipster vibe.
It's especially strange since Ubuntu is not an operating system (though it includes GNU/Linux, which is).
Pretty sure the whole survey is a joke/satire.
Edit: Now 100% sure that it's satire, since it's actually spelled "Unbuntu".