The creator of Golden Kamuy (the anime this video is from) actually had his story supervised by an Ainu (indigenous Japanese people) language linguist and is actually, as far as i can tell from personal research, pretty closely accurate to how Ainu culture IS
The kid in the video is an Ainu child, and children are usually given disgusting sounding names to ward off sickness and ill-health
Later in life, they’re given their own unique names and aren’t actually named stuff like “boner” for the rest of their life
So this isn’t a case of “anime being anime”, it’s actually a culturally accurate representation of Japanese indigenous people who are often misrepresented