I don’t necessarily think he’s a square but he doesn’t conduct himself or think as someone beholden to African-American society/culture. Outside of skin tone...nothing about him seems like a Black man or someone who identifies with the Black experience...here’s a quote of his regarding Kaepernick/Kneeling:
“For me, I love the flag. I love the National Anthem because it's an emotional time for me because I'm so grateful I get to play on the football field. And every time I get to put my hand on my heart, it's truly an honor -- you know, the military, for me I think about my family members who have served, and friends -- I train down in San Diego all the time, so I'm around the Navy and I see those guys around. And all they do for our country and the people in Afghanistan and all these people fighting. 9/11, for example, coming up“. - Russell Wilson
This is something a White person would say straight up. So when you factor in that he speaks with the cadence and tone of the average White American and has thoughts congruent with White society then it is understandable why Black people would be like “homeboy is corny”. Many Black people have spoken proper English like Malcolm X and Martin Luther King and no calls them a square cuz the content and cadence is clearly consistent with someone who has had an African American experience.
To hell with cadence, but your comment is the first one to make sense to me regarding his 'blackness'. Thank you for using logic and providing evidence(I don't know how true it is, but regardless you made a great point).