Would any scientific and medical studies using Lance Armstrong in the past be valid today?

I don't know how much real science was studied on a pre-dope admitting Armstrong was vs how much was just marketing that looked like science but let's assume the scientific studies were authentic.... would his admissions discredit any studies that he was a part of in a control experiment?

I know that Armstrong has a abnormally large heart and the theory is that increases oxygen levels which gave him a physiological advantage against normal sized hearts BUT so would blood doping and EPO use (I believe). I am pretty sure some scientific or medical experiments centered around Armstrong being the subject on such a matter. Does his admission invalidate any study conducted on this experiment specifically? And has any scientists publicly shown such a concern?

I am not a scientific type person by the way. So maybe any experimentation on Armstrong made the scientific community roll their eyes anyway and never took such studies seriously (as I suspect it was more PR than science but I am cynical... Maybe those were valid studies and now I wonder if they would be questioned today).