According to that entry, it appears in both Swedish and Czech (as an alternate spelling).
Given the commenter's username is krokku and the fact that "krok ku" means "(a) step forward/towards" in Czech, I think we can assume that the commenter is Czech.
But given that the rest of the OP's comment was in English, it is natural to interpret the GPs comment as meaning "not a native speaker of the language they wrote the comment in (English)".
https://en.wikipedia.org/wiki/Quasar.