The core of stoicism (stressed more by Epictetus, a former slave, than Marcus Aurelius) is that we should not focus or worry on things we can't control. We can't control other people, or societies, or the unforeseen tragic events we may experience, but we can control our own actions, our own thoughts, and the way we respond to them. We can't dictate our emotions, but we can handle how we express those emotions.
In many ways, it's similar to what you might learn going through therapy. But the mental health and difficulties that men face are somewhat overlooked by society and not taken as seriously as maybe they should be. In that environment, literally any strategies at all for dealing with stress and anxiety that are tailored towards men are going to be popular.