Wouldn't the simplest explanation be that someone who had direct access to change the system prompt changed it alone? Would Elon be able to change it himself directly? If not, assuming he ordered someone else to change it adds an entity.

While I have no idea what actually happened here, my instinct is that this was done by someone who wanted Grok and Musk to look bad, not someone who wanted to change the world to view white South Africans more positively.