I think there is a cultural spect to be considered here, rather than than an ethnicity one.
No-one would dispute that some cities have large Assian populations, and they tend to congregate in areas where Asians have historically settled - I know, I live one.
If we accept then, that black and Asian comunities live in smaller housing which is set closer together - terraces being the most popular, and add in the cultural aspect - that Asian families and communities interact frequently and closely together in each others' homes, to an extent that native British families do not, then it is an acceptable assumption that the risk of Covid spread is going to be higher than elsewhere.
The law of numbers comes into play - more interaction - more infection - more hospitalisation - more fatalities.
That can, and apparently has, led to an erroneous conclusion that people of Asian and black people are more susceptable to infection, when actually, there are simply more of them becoming infected and then falling victim to the virus.
It's taking two and two and making twenty-two, and the media will use it to stoke even more irrational fear than they do already, which is not helpful at all.
Roll on vaccination.