Most HBD advocates I've encountered don't just claim that the statistical correlation between race and IQ can be explained by genetics; they also claim that people with high IQs are better than people with low IQs.

Actually most of them make a factually true statement that high IQ people are more pleasant to be around than low IQ people. I don't recall them arguing low IQ people have lower moral value. By far the most popular HBDish blog is iSteve by Steve Sailer, who clearly does assign equal value to people of different IQs. Some of the commenter on his blog are clearly racist, but that statement is also true of the comments to many crime stories on any news site.

The only group that really fits your bill are extreme white nationalists, but they basically use the IQ scores as a political bludgeon ignoring the higher Asian and especially Askenazi Jewish scores. They are easy to spot.

I often see HBD presented as a heroic scientific effort, one that is only embraced by those truth-seekers brave enough to swim against the tide of political correctness. But HBD (as presented on the HBD blogs I've encountered, at least) is so fraught with value judgments that I have trouble taking it seriously. I have to wade through all sorts of claims about how awful black people are in order to dig out the bloggers' actual data. Furthermore, I distrust the factual claims of anyone with so obvious an agenda.

I would directly challenge your claim. There are great truth seeking HBD blogs like West Hunter, Gene Expression, Evo and Proud, ect. I would argue that on LW mostly only such blogs ever get linked.

I'm not familiar with vdare.com, but I think it's perfectly reasonable for a truth-seeker to reject a source for making blatant value judgments. If the findings reported in that source are in any way scientific, they will be contained in the academic literature, which is presumably more neutral. A truly conscientious truth-seeker might want to completely avoid bloggers with political agendas, and go straight to the scientific journal articles.

Actually the linked article is written by Professor RIchard Lynn a controversial scientist but one that is heavily represented in the academic literature. I doubt his positions in the article depart much from his stance in various papers. Judgement by author rather than by site seems much better suited if the author is notable.