Without spoiling the fun by watching the video I'm guessing they're going to update it to use gtk3 and pulseaudio!

https://github.com/audacity/audacity/issues/1213

https://github.com/audacity/audacity/discussions/932

https://github.com/audacity/audacity/pull/835

https://codeberg.org/tenacityteam/tenacity

Sounds like spin to me.

That said, the dark theme looks nice, and I'm glad they support macOS. I use Audacity from time to time, but I'm not a producer or anything. The current version is fine, my only complaint is it's too dang bright. Same could be said of a couple tools in my toolkit but I don't complain because I have a Mac and these developers target Windows first because they have to and Linux second because that's either what they use, or what they like. Mac users have kind of always been the third wheel? It's not free, it's not tied to hardware, and it's not tied to gaming, buying a computer from an old school computer company that doesn't sell your data to the highest bidder (like Microsoft and Google do) and isn't particularly concerned with gaming is just... well, not many people's cup of tea. And that's fine, we like what we like and we appreciate what we get.