Know what you do if your change caused a problem? You back it out if you can't fix it right away. Implement the parts that work instead of being like, 'yeah well, there's bigger things to worry about' because some people will actually care a lot. My mother in law is disabled, playing Ark is one of the few things she can do without being in severe pain and she cares a lot about the color.
Also the explanation doesn't make any sense, how would mods that do nothing to the color array be affected? Explain to me how S+, something has nothing to do with dinos at all, also experiences this issue.
Before this change, for every mod installed, the core color definitions were being duplicated. This only impacted mutation colors though because for mutations it randomly selects from any and all colors in the master color array (rather than only a subset in dino specific color definitions matched by name.) Mutations were selecting duplicated color definitions and now the duplicates are no longer there.
There is also more to the thread this screenshot was taken from, including where I talk about (in addition to trying to make the problem correctable in the future, because this isn't a problem that can be completely removed with respect to mods being able to add new colors at all) also making it so that where these colors were lost that it will reroll new color mutations for everyone that was impacted by this.