ANDY, the report can be found here,
https://www.thelancet.com/journals/eclinm/article/PIIS2589-5370(20)30374-6/fulltext
At Section 4 of the Report, the authors mentioned the reasons you gave and suggested other possible contributing factors. They wrote,
“In conclusion, we found clear evidence that patients of Black, Asian and Hispanic ethnicity are more likely to be infected with SARS-CoV-2, compared to those of White ethnicity, and a possible association of higher risk of ITU admission and death from COVID-19 in Asians, even when most confounders are adjusted for. Our findings should inform public health strategies to minimise exposure risk of SARS-CoV-2 in ethnic minority groups, by facilitating timely access to healthcare resources, and targeting the social determinants, structural racism, and occupational risk underlying inequities."