In my limited experience, SwiftUI is excellent for iOS development, but it requires a lot of extra effort to get good results on macOS. I suspect that’s why.

They’re more likely talking about their use of SwiftUI on Windows

I didn’t realize anyone had implemented SwiftUI for Windows. Is the source available?

yep, they worked with the swift devs to implement it, i think there are some videos in their yt channel talking about it

they have some repos with the source code in their github https://github.com/thebrowsercompany/swift-winrt