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 agree it does look quite atrocious- apologies, but I felt it was interesting enough to post anyway.