Being from a country and playing a sport in the country they immigrated to doesn’t mean the country they came from is big into that sport…
What you’re saying is like saying “many who like this very US specific food are not from the US, so that means that food is common outside the US.”
How do you not see the idiocy of that?
It’s still a mainly US specific sport, the fact that many who play it (in the US) aren’t from the US doesn’t change that fact at all.