This thread is baffling. Most of the comment replies are about KDE, for which Kubuntu (with a "K") is a completely separate spin.
The XFCE-based Xubuntu spin includes nothing of KDE by default, and neither KDE or Kubuntu are mentioned in the linked article at all. Call me cynical, I just don't think most people clicked the link or even took a close enough look at the title here.
There are no KDE apps or libraries in Xubuntu. I'm pretty sure that I would have noticed in the 10 years of using Xubuntu and updating it with Synaptic.
The XFCE-based Xubuntu spin includes nothing of KDE by default, and neither KDE or Kubuntu are mentioned in the linked article at all. Call me cynical, I just don't think most people clicked the link or even took a close enough look at the title here.