As Sven notes, your reason for thinking that’s a VLQ in need of deletion are wrong, but you are right that it is VLQ and should probably be deleted.
Domain controllers don’t really have local accounts, and the built-in administrator account is reserved for directory services restore mode (DSRM), which is why he couldn’t find it. His self answer is total crap, and I can definitively state that he didn’t do what he claimed (or wasn’t doing it on a domain controller, at least).
So yes, I agree that this question and answer is delete-worryworthy crap.
Since it seems like you won’t be able to get the mods to delete it, the other option is to get it voted down to the level that delete votes are available to the higher rep users with that privilege (-3, I think, and maybe a question with an answer needs to be closed too), and then get three high-rep users to cast a delete vote.
... which you do by basically doing what you’ve done here, making your case and drawing attention to it in meta. I’ve done my part. If you can attract another couple downvotes to it, I’ll be happy to throw my delete vote it at it too.