the question depends on whether you look at it purely from an lyrics perspective aka is the song sung mainly in English or Korean or something else...
or do you look at the group behind the music
like even for a lot of twice songs they speak English in them and sometimes more English is said than Korean (or Japanese) would that make it a hybrid English-Korean song?
personally I would say that if the group trained in korea like a kpop group and debuted in korea like a kpop group (regardless of what language they sing in or where the members came from) then it would be kpop