For me, searching for "uBlock origin lite" (without the quotes) puts it in 3rd place; below AdBlock Pro and an ad for trip(dot)com.

When I search "uBlock origin" it doesn't seem to show up at all.

Sorry, I should have been clearer. I too get the same for Mac apps, but for iOS apps still see the same competitor results returned first. For me, that's the same whether I use the App Store from my phone, or laptop.