There is no longer any controversy among credible medical researchers that Covid causes clinically significant harm to the heart and the vascular system, including damage to blood vessel linings, clotting disorders, dramatically increased risk of heart attack and stroke, and so on.
Like everything else, this cardio-vascular damage (and associated risk) is cumulative with repeated infections.
Current research in this field explores prevalence, severity, mechanism, and possible treatment avenues, as authors at this point have an unassailable body of prior research they can cite in the preamble to establish the fact of said damage.