Thanks, @johnbishop I had wondered about this also. The only thing I had seen was that people with diabetes are more apt to have heart conditions which can be problematic if they contract COVID. This article is more explanative.

I do not remember where I read this unfortunately, but I did read somewhere that although people who are on immunosuppressants are more apt to contract COVID, if they have it their outcome is not worse than people not on immunosuppressants.
This is from a small study in Italy:
https://www.hepmag.com/article/immunosuppressants-liver-transplant-recipients-may-increase-covid19-risk
There is still so much to be learned about COVID and much of what is published contradicts other published studies.
JK