> would you therefore conclude that using vim/emacs leads to garbage software?

I cannot conclude that "it leads to garbage software", but I can definitely conclude that "it has ever led to garbage software" at least once, and in some "shape or form".

> Claiming vim/emacs leads to or directly contributes to "quality software" is the same

This (or the alluded opposite) was not the original claim. The original claim was the total impossibility of vim/emacs to have ever led to quality software, in any shape or form. That is the only claim being contested here.