User blog comment:Kogath/Monster Hunter: World Discussion/@comment-6050823-20200120202226/@comment-4370375-20200121023037

I re-watched the scenes discussing Safi and it seems like the characters were referring to Xeno as a species, not specifically the one slain in base World's story since the game has you slaying multiple Xeno'Jiiva when you count both the optional and AT.