Expressing your emotions honestly is also a way to have antifragile relationships, but if you've built a relationship in which honesty wasn't valued and you have an agreement to hide the truth from one another, doing it all of a sudden would most likely be a pretty jarring experience and most likely result in many people leaving.
We live in a deeply codependent culture in which we are constantly trying to protect each other from our own experience (ie, not telling the truth for fear someone can't handle it) and so we walk around on egg shells.
I think it's worth the discomfort of working to be honest. It's difficult at times, and I surely don't succeed all the time, but when I do it is always worth it.
When I read this guys article what I hear is him saying "being myself is terrible advice" which is a common experience for many people, one that they are taught by their family and society in the earliest days of their life.
It's difficult and frightening to let go of that narrative and less frightening to simply pass it down stream to the next generation - through conscious means such as this article, or by unconscious means via shaming.