The possible blood group link is blood group A (NOT group AB).
Preliminary results suggest people with A type blood are more at risk of ending up in hospital with the virus and the lowest being group O.
I remember this as my blood group is A!
(I'm not sure, though, if we know if it's because A type people are more at risk of catching it or more at risk of developing symptoms that require hospitalisation).
According to this article, A is the most common blood type in Wuhan.
the normal population in Wuhan has a blood type distribution of 31 percent type A, 24 percent type B, 9 percent type AB, and 34 percent type O
I'm not sure how AB factors into this. People of Asian descent are more likely to have AB blood than Caucasians, but as AB is rare the numbers are pretty low: 7% for Asian people and 3% for Caucasians for the AB +ve group.
So, although blood group may be relevant to coronavirus cases, I'm not sure it's resulting in more Asian cases or deaths.
Blood group by race here: www.livescience.com/36559-common-blood-type-donation.html