You probably didn't understand what was meant. Stroke risk was increased by estrogen but all other cases of heart disease was significantly decreased. Women are not at risk of heart disease.
Tell me, what is the chance of getting a stroke if you don't have arterial calcification or atherosclerosis? It's almost zero unless you have a genetic disease with hypercoagulation. That's why teenage girls don't stroke out. So the extra clotting caused by estrogen receptor activation and their effects on liver excretion of clotting factors is meaningless when you don't have any of the other issues.