Screen Sharing between Kindle Dx and Mac?

I found instructions here:

https://tinyapps.org/docs/e-ink-monitor.html

But I can't get it to work. I'm not quite sure why.

When I type up the commands and connect the Kindle to my computer, there's nothing on either side to show an option for screen sharing.

If it depends on shift-VU at some point, I don't know where, and I don't have the coordination for that command.

I was trying to MacOS's built-in screen sharing options instead of installing additional screen sharing software for it.