Can you point to one that says he does? I think it’s funny that you think it’s it’s perfectly acceptable for you to assume he has a pre existing heart condition, yet unthinkable for us to assume he didn’t?
The truth is none of us knows, so all this assuming is pointless, and beside the point anyway. Even if he did have a pre existing heart condition, the officers were the reason he suffered a heart attack at that moment on that day. They are liable.
A man with a perfectly healthy heart being scared by an arrest into developing a brand new heart condition is far less plausible a medical explanation than a man with an unhealthy heart being scared into aggravating a preexisting condition.
If someone's heart is so fragile that an arrest can give them a heart attack, the chances of them living 50 years - and a good chunk of it in Brooklyn - without having any severe stress in their lives before the age of 50 is approximately 0.000%