We don't have to trade insults. We disagree and that is fine. I have a whole lifetime already of growing up, and being instilled with a variety of principles and values from a wide range of sources. I feel comfortable taking the position that I do here. But if you disagree, that is fine. We don't have to agree on these things
I subscribe to the John Brown method of resolving these sorts of issues.
I'll leave it at that.
I might be getting my terms mixed up, but cosplay is short for constume play, right? Other than those involved in live action role playing, I don't think I've ever seen someone cosplay during a table top roleplaying game. i.e. I've never had a Call of Cthulhu player show up to the game wearing a suit, suspenders, and with their hair slicked down with Dapper Dan pomade or wearing a flapper style dress. Though that honestly might be pretty cool. In a role playing game, players are epected to take on the role of the characte they're playing. I ran a Call of Chulhu game set in the 1930s, and one of my white players had a black character. Was he cosplaying? No. None of this is about cosplaying.
Its hyperbolic and meant to be more abrasive than Connor's attempt is in the book. It isn't literal.
As said though, the book provides fictional cultures for you to explore. That it encourages indigenous folk to, more or less, play as themselves is meant to be inclusive and empowering in the context of an alternative history game where indigenous America was allowed to flourish uninterrupted.
To be a white person, which I can only assume accounts for more or less every person who has the audacity to get mad at that inclusion, actually get this mad and start throwing around "discrimination" and "racism" all willy nilly because they, as white people, are being asked to not go pretend to be Cherokee or Lakota Sioux when they aren't, is peak stupid. I'm not going to even sugarcoat that.
This wouldn't be the first time bad actors jumped at the opportunity to cry wolf about whites being oppressed. Nor will it be the last.