You say remove discrimination and then use a discriminatory strawman. No one is suggesting a code contribution must be accepted based on a minority status. They are saying that to get a decent functioning community for everyone you need a diverse range of people in positions that set the behaviour of the community. You can't get the CoC and enforcement of it right unless those affected are in positions that influence it. Your enforced anonymity doesn't work because there are other ways of gendering and racialising people (e.g. based on who people talk). Additionally, what you are saying is that minoritised people have to hide who they are so they don't get discriminated against rather than just deal with those doing the discrimination. They are called communities because that's what's they are: people want to be part of something and that involves sharing a part of themselves too. Open source projects live or die on their communities because they mostly don't have the finances to just pay people to do the work. You need people to beleive in the project and not burn out etc.
You lose nothing by making sure people from all backgrounds have the same opportunity and enjoyment being part of it. If you aren't in a minority and don't care about those that are then just say so!