How would a designer describe the ‘scrolling carousel’ type behaviour on this homepage?

I see some interesting UI behaviour on this landing page which I've not seen before, I'm trying to do some research on similar implementations but I'm unsure of the appropriate UI terms that designers might be naming such behaviour with. I'd describe it as some sort of vertical scrolling carousel with a progress bar, though vertical scroll and carousel feel like contradicting terms to me.

Can anyone advise what the correct terms would be that designers would user to describe this feature? And any other live examples of such behaviour?