Regardless of whether It is a clone or not, there are plenty of ways for Sasuke to survive this blow. Hashi chakra, Juugo flesh, Karin, Sakura heals, Tsunade heals, katsuyu heals, zetsu goo can probably work to, and there are probably more.
Someone with EMS that isn't able to see through a simple ink bushin?? Then kishimoto is desperate for recovery at this point. I doubt it but i did originally think it was some kind of clone however Madara cant bé fooled by clones of that calibur