In the comments many people are complaining that it's macos only, but one of the hosts say that they didn't just use screenshots to use the UI, but accessibility settings to see things hidden from what is visible on screen. So here's the reason... seems like that Apple's focus on accessibility will pay off and not help just people with disabilities.
Wonder if that's also the case for web-based UI like Spotify, or if the accessibility APIs are only useful for native applications.