Is Streptococcus pyogenes killed by iodine?

Yes, on shallow cuts and abrasions. From "Surgery, gynecology & obstetrics, Volume 1" by Franklin H. Martin Memorial Foundation, American College of Surgeons:

"It will be noticed in glancing over the table that the most common and the most dangerous microbe with which the surgeon has to contend -- the streptococcus pyogenes -- is killed in two minutes when exposed to a solution of iodine of only one-fifth of of one percent."