Is it? What does it achieve? I think anyone browsing HN knows the opinion of the average HN user on scrolljacking. If they're still doing it it's because either they don't read HN or they have data that proves it works.
Not sure why this was downvoted. I agree, after the 10th discussion on how designers are breaking scrolling, I'm not sure what is achieved apart from "yeah, that still pisses me off too!"
Honestly, I think it might help. I design websites sometimes and I'm on here. At first I was kind of into it, but HN helped me see the error in my initial excitement.
This implementation especially is incredibly obnoxious.