A lot of judgement on a semantic that is generally accepted to be the exact opposite of what you are declaring. First given the context of the root of the word "cide", patricide, regicide, matricide, a majority of people still believe that the word predicates physical/biological harm in the form of death. If you want to expand the definition, fine but it isn't truth or the majority. If anything you should find a better word.

It was created by the UN which represents just about every country on earth, and which 150 countries have signed. And it dates back to 1949, so even if it was an expansion then, it is by no means one now, nearly a century later.

This should not be downvoted, dx87 is correct. "Genocide" means "the killing of a people", where that group can be ethnic, religious, national, or something else. Mass murder is one way to achieve genocide, but it is not the only way: exterminating a group identity through detention, mass sterilization, forced re-education, etc. are all also genocide.