I think GtkFalse is an April Fools’ Day joke:

https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6nX8Hp99PWd_k46FIW4Iis14VQYWL6-PIZfP32SbFAK5_scP0kgnhWzpkPskbP5kPgEHHze5RkV1en41wq1Grt_ULXSHWEwF8Vm_Aq-K9MS9HuMVAi16BSk0duPz7KTNZG91WhSrfY_Q/s640/2014-04-01--13%253A48%253A59.png

I just couldn’t believe someone would go such great length to create a GUI version of /bin/false and in the end it fails because it exits with success, not like false with exit status 1.

It’s written by Florian Diesch in Python 3 under GPLv3, currently version 0.01 (2014-04-01). Judging by the release day on author’s website, I’m 99% sure this is a joke.