I would encourage you to try to avoid making such easily falsifiable claims, and put at least some token effort into your arguments. I was able to find the below with less than five minutes of searching.
https://www.timesofisrael.com/after-musk-prods-adl-says-kill...
Said tweet: https://x.com/elonmusk/status/1686037774510497792
He also endorsed an X post claiming "Jewish communities have been pushing [...] hatred against whites," calling it "the actual truth." https://www.cbsnews.com/news/elon-musk-antisemitic-comments-...
He has also repeatedly advanced a version of replacement rhetoric (e.g. claiming Democrats import immigrants to change power via the census), which is essentially a repackaging of the Great Replacement idea, i.e. a racist conspiracy centered on replacing white populations with those from other races and ethnicities. You can, for example, read the transcript of his interview with Don Lemon.
So yes, Elon does in fact frequently talk about white people. Even when not explicitly mentioning them, he means them. For example when he says people should have more babies, he specifically means white people: https://newrepublic.com/article/181098/elon-musks-weird-obse...
>> Same issues are faced by many asian countries as well.
I find your comparison of this issue to issues faced by various Asian countries to be pretty odd, as it does not stand up to critical scrutiny. Asian countries' demographic crises are about internal low fertility and rapid aging, not about being "replaced" by outsiders. Indeed, the arithmetic makes the comparison impossible: Japan, China, South Korea all have extremely tiny foreign populations. Therefore, pointing to Japan/Korea/China's low birth rates to sanitize "replacement" talk is a bad-faith pivot.
All kinds of people have equal right to defend their own culture. It doesn't mean that they're supremacist or racist, even if they think that their culture is better than some other culture. It's only supremacist if it aims to destroy, repress or subject other people, by advocating discrimination and violence.
Thus, "make more white babies" is not supremacist or racist. As isn't calling out violence against white people in South Africa.
The only times he seems to talk about "white" people is when these people are being prejudged for their skin color.