> No, this is pretty obviously deliberate on their part.
I'm not so sure about that. Because 1) this phenomenon seems to be present on non-political topics, and 2) other, even more right-wing figures are still easily findable on Google (including links to their own websites). That raises the question, why this guy and not the others? Heck, it not even this guy, just this term, since the blog in question is the fourth result for "steve sailer" and even autocompletes.
I think it's a very reasonable theory that the same phenomenon as I found with "fallout shelter," is at play here but the difference is your "iSteve" blog doesn't have the relative popularity to peek through even a little bit over the pop culture thing (v.s. fallout shelters, which is a topic with a significant popularity, even if it's far less popular than the video game).
> Meanwhile, Yandex, DDG, and even (I checked just now) Bing all have results for it on the first page when you search "isteve".
It's quite plausible the reason for that is because their algorithm is different, and not so biased towards popularity as Google's (perhaps because they don't rely so much on click-stream data to determine what people want to see).
Google search has gotten really terrible in recent years, especially if you're looking for something a little off the beaten path in situations like this, and I think the exact reason is an over-reliance on click-stream/popularity data.