This isn't scrolljacking. Scrolljacking generally refers to modifying the normal or expected scrolling behaviour. This has a single sticky section floated over the top of a normally scrolling page.
This one is better than some. At least the content is still scrolled naturally, and only the media on the right is locked. Nothing is worse than a site that is completely hijacked, where no matter how many rolls of the mouse wheel, you have the wait and see each downward animation one at a time.
I really wanted to read about slot machines but I'm not suffering through that.
Does this need to be a new hn flag? This is the second of these today.