Most of these initial Polsat subscription channels did have the sun but didn't have Polsat in their official name. Other examples (these are all from the tip of my tongue):
On (Him: consider this as a "grandfather" of Polsat Play)
Ona (Her: basically it was a "grandmother" of Polsat Romans and...
Maybe they are using it as a testing ground to rebrand it as Polsat Comedy. They already have tons of channels with their own name and tag slapped onto it. Recent examples include Polsat Doku and Polsat Games.