Also curious that shorts are popular on TV? Maybe it's kids or people without a dedicated device using smart TV features or a console to watch?
But I think one of the biggest factors for shorts on YouTube TV is that they're not separated out into different rows or areas like they are on mobile/desktop. On the tv, they're mixed in with the rest of your regular subscription videos.
I rarely watch several in a row, but I typically watch one when I scroll past the Shorts section.
More users are watching YouTube on TV than mobile