There is absolutely no proof a CoC drives "inclusiveness", whatever it means, however there are multiple examples where codes of conducts were used to exclude contributors because they said something someone did not like in a setting completely unrelated to the project community.
https://www.inc.com/sonya-mann/drupal-larry-garfield-gor.htm...
CoC are political tools to eliminate diversity of ideas and impose an "intersectional" mindset on all contributors, under threat of exclusion.
Larry did not harass anybody in the Drupal community yet was kicked out of any official Drupal related conferences and cannot contribute to the project anymore, just because he shared a fetish with his wife someone did not approve of.