How exactly has it been invalidated?
By pointing out that SOME widely used software (mostly web/web infra with unix heritage) has been written using vim/emacs as the text editor?
Now, you can find endless sea of garbage software on github that is written using riced vim/emacs setups - would you therefore conclude that using vim/emacs leads to garbage software?
The only thing you can conclude here is that to write software (either good or bad) you generally speaking need a keyboard and a text editor.
Claiming vim/emacs leads to or directly contributes to "quality software" is the same and about as meaningful as saying that keyboards and text editors lead to "quality software".
Cargo cult insanity.