Let me prefix this with that DHH's opinions suck, not sure what he's going through but clearly something, and that blog post you're referencing is terrible in lots of ways. But he's not openly calling for ethnic cleansing, you're doing speaking against him a disservice by not providing an accurate view of what shit thing he said. It's still terrible, the verbatim quotes (https://news.ycombinator.com/item?id=49448148), but deporting isn't the same as "ethnic cleansing". Even people we disagree with vehemently should be disagreed with honestly.
Then that blog post is just one of many where he've essentially gone of the rails in terms of hardline authoritarianism and fascist ideas, which makes it kind of weird he's getting the financial support he's getting. But then some just don't care about what viewpoints others have, I suppose that's a valid stance too even if I disagree with it.