You are conflating two different things. Stoical calm isn't just silence, it's silence when the situation calls for such, when making your voice known cannot improve things. Engagement in communication is encouraged if it is believed to lead to good outcomes(although how "good" is defined is left more ambiguous). Stoic silence works best when it's used to be a good listener.
In comparison, masculine silence of the "strong silent" form, which occurs frequently in my family, and even myself, acts to reinforce existing privileges - it leads to excessive maintenance of a self-assured, unflappable image, not betraying weakness or answering to anyone, even when you need to ask questions, share responsibility for a problem, or should collaborate and submit to a group policy on behavior. It's ultimately built on the kind of anxiety over one's role described in the article, and it's a major penalty to healthy communication within the family, because it creates a stagnant bubble of "shall-not-be-challenged" behavior and outlook.
I'm actively working to disentangle the two within my own life. I've had the listening part down pretty well for a while. I had to learn when my responses were turning into image-asserting judgments, explanations that were unasked for, and other communication-blockers. I still have some trouble asking for things. I still have plenty to learn about when to become more engaged and active.