https://www.cia.gov/the-world-factbook/
https://www.washingtonpost.com/news/worldviews/wp/2013/05/16...
Literally no diversity proponents are saying tech teams in Taiwan must have 20% African Americans or whatever and you'd have to be completely missing the point, or willfully missing it, to think so. In any case, it's pretty telling of your level of understanding of the topic that you seem to think that's what we're saying.
Likewise using friggin India and Nigeria as examples of "fully homogenous" countries is also very telling of your knowledge about other countries from your own. Just wow.