On the subject of the Glitch ending, I personally don't feel 'Glitch Ending' is a very accurate name for it - the only Glitchy thing about it is the credits (intentional), and the name 'Glitch Ending' makes it sound as if the ending is buggy and unintentional, which it obviously isn't
I can't think of many fitting names, but maybe 'Desolate Future Ending'? Or considering the nature of it activation, just 'Secret ending'?
Of course, I might just be having stupid ideas, or even better for all i know the game itself might call it Glitch ending, but hey, just throwing ideas about