What does that mean?

Factorio is a Linux native game and some of the nicest people I have ever met online I have met through that game. It doesn’t fit your last criteria but you often see people again if you play on the same servers.

I have kde plasma for my desktop but I (incorrectly) assumed that the article was talking about running games on kde

I'm pretty new to gaming on Linux, does this work better than downloading steam and running proton?