Of course he died because he was sick, i saw some people saying that too that Sasuke defeated Itachi.
They are idiots...MS>>>>>3T Sharingan, clear as that
still doesnt really prove that sasuke won. if anything he lost for a bit longer since he didnt do what Itachi wanted. although that did ended up with him getting EMS though. Still went according to Itachis plan. in the end Itachi still used KA to his advantage, so one way or another his plan still worked. Sasuke got his powerup and hes fighting villians.