Actually, I won't use his feminine side to prove his masculine side. I just admit the existence of both within him. Both males and females have feminine and masculine qualities. The masculine side gets expressed when we're working toward a goal, making progress, getting things done, and pushing forward. The feminine side gets expressed when you move with the flow of life, play, do creative activities such as dance, painting, writing ...With Yuzuru, he always gets in touch with his feminine side on ice to a certain extent ( and maybe in real life too). I don't think because he's confident and comfortable with his own masculinity, he dares express his femininity without being afraid. In my opinion, when performing NS, Haru yo koi... he was simply expressing his elegance, his sensitivity, his gracefulness ....which define his feminine side on ice. And it's nothing to do with his masculinity.
ETA: "I don't think because he's confident and comfortable with his own masculinity, he dares express his femininity without being afraid" This sentence might make some confused I mean although I fully agree that he's comfortable with his own masculinity, I don't think because of that/ it's the reason why he dares express his femininity. In other words, IMO being masculine and being confident and comfortable with it has nothing to do with having ability/ courage to express one's feminine side. Sorry, I'm bad at expressing thoughts in writing, especially in English