I think you’re reading too much into it! This seems like a cute design library for eg. a personal blog or a portfolio website. I really doubt the author thinks this is the best design style, it’s just got an aesthetic that it sticks with, which is fun.
Haha I suppose you're right. I do get a kick out of similar CSS frameworks that mimic the look of Windows and other OSs. I was just triggered by "beauty of TUIs", but beauty is in the eye of the beholder... :)