Yes, this advice is counter-productive at best for dealing with a narcissist. They will re-frame your efforts to be friendly and not abrasive into an admission

Yes, this advice is counter-productive at best for dealing with a narcissist. They will re-frame your efforts to be friendly and not abrasive into an admission of guilt over whatever the problem at hand is. In those cases, if you can't avoid communicating, just be neutral and stick to plainly stating the facts of whatever you must talk about.