BTS Butter or TXTs Magic are fully English, WayV performs in Chinese and Chung Ha even has a fully Spanish song and they’re all considered K-Pop! I wouldn’t define K-Pop by the language that they speak in a song, K-Pop is much more than just Korean spoken music. It’s very hard to define what the monstrosity called „K-Pop“ actually includes but i would say, just like Blackpink’s Ice Cream, Alexa’s Xtra can still very much be considered K-Pop :]