It's an excellent article, and the work within is very well done, but there's a part of me that screams "Why would you introduce this much complexity for what should be a simple scroll?" (overcoming technical hurdles to produce the desired end result aside).
OP is doing a basic analysis on what kind of solutions exist for a typical UX edge-case. They even provide the simple solution that most people use (margin-bottom).
And for fun they go on to see if they can solve it without the minor drawback of the simple solution.
We've got to stop acting like it's a badge of honor to avoid UX consideration. We might not be people who implement UIs, we use UIs all day and should be able to muster up a few opinions about how a UX interaction should work.
Which is what I loved about this article - it demonstrates a sizeable effort resulting in a UI implementation that is just not much better than having callouts / figures in the text- and then admits it.