Age is tied to the comorbidities as older people tend to have more disease such as COPD, diabetes, heart disease etc. Its not necessarily a comorbidity on its own.
Do you know for a fact his BMI is >30 or is that an assumption?
His health check in June:
73 years old
63
244
https://www.documentcloud.org/documents/6935798-Trump-medical.html
That is a BMI of 30.5
And yes, BMI over 30 is listed by the CDC as a risk factor. There are many studies out there worldwide that say the same.
I am not saying he is going to have a severe bout, I am only saying he does have risk factors and we need to pray he doesnt.