That's lumping all the areas of a large city together and doesn't take into account factors other than ethnicity. If you're arguing that areas with high levels of "Asian" ethnicity have higher levels of the virus (which you appear to be), then you need to look in more detail. It doesn't seem to apply Loughborough and Nottingham, it may or may not apply in Leicester, it seems to apply in Blackburn. So it's not everywhere and the point still stands.