True, all of these are very serious conditions. But none of the them are treated by fallopian tubal ligation. Excision of a fallopian tube is morally justified in the case of removal of a tubal pregnancy, since the tube itself has developed an abnormal condition and is threatening rupture, which might indeed kill the mother as well as her embryo.
However, tubal ligation is not a treatment or cure for pulmonary hypertension, Marfan's syndrome or congenital aortal malformaton. It does nothing whatsoever to heal these conditions.
No, it does not cure the diseases, but it does alleviate the risk of pregnancy when a future pregnancy could be life threatening.