That was my comment. It seems that they use MacOS as their primary system and have KDE running in VMs as "projects".

When I switched to Linux in 2008 (Ubuntu), I felt a big relief from not using Windows anymore, andnever turned back.

I was also surprised to see that they use Macbooks. I also have one but I find it a weird decision to showcase in a documentary about KDE.

Kudos to the guy with the Dell(?) laptop in the video. :)

Maybe some of those original developers have just moved on to new jobs and projects?