It’s free to host a mod on github. Mods like this and the pride flag remover for Spooderman are just trolls seeking attention and outrage, so they have to make sure to be very visible and find-able. Nexus has no obligation to host those files and if the modders actually wanted to play the game with the changes (and enable others to do so) it’s totally possible to do that without Nexus. They upload to Nexus (which has a clear policy against this) so that they get exposure when “journalism” reports their mod being deleted (since talking about this is free Engagement™)