I find it telling that both of those sources (one of which cites the other btw) conflate posts about "race science" and posts that are "anti-immigration conspiracies". These are not remotely the same thing. Elon is clearly against immigration policies enacted by a large number of western countries, a stance which does not make one a Nazi or white supremacist.

Also in that Guardian article the evidence given for him being an anti-semite are that he unbanned people on Twitter and that he supports the AfD and told the country to get over its "past guilt" (a two-word quote btw is a sign of journalistic malfeasance, if you can't fit the context of a quote in your article then don't include the quote at all).

So, that's really extremely underwhelming evidence and honestly I'd appreciate a more critical reading of the source material you've provided.

I think you and MANY others should probably have a significantly higher bar for calling someone a white supremacist or a Nazi given all that such a statement implies.