How does making everything wiggle and jiggle on the screen more accessible?
It doesn’t. But it can replace some css.
Unfortunately the tool he published is not FLOSS. I have animated SVGs in Inkscape previously (because why use SVG+CSS or SVG+JS when you can just do it in SVG), but the workflow is pretty horrible, not made any better with how steep of a learning curve inkscape has if you have no experience at all.
Here’s to hoping someone makes a FLOSS alternative to his “motion” tool.