I missed that discussion yet had the same trouble grokking the phrase. Even after watching the video and sort of understanding what they do it didn't click until I read your comment.
But then again, I rarely use Zoom since my company is beholden to Gsuite.
I saw the phrase next to the bouncing down arrow and I thought it meant that when I scrolled down, things would zoom around on the screen. Or something.
Perhaps my mind had been primed for that by this discussion from the other day:
https://news.ycombinator.com/item?id=25191802
It honestly did not occur to me that the phrase had something to do with Zoom meetings. I use Zoom nearly every day but I'd never heard of Zooming before.