As long as the intestines don’t get sliced up or covered in crap (and need debriding,) they’ll just button it back up and repeat the healing process. This time with added instructions to not sneeze.
He had abdominal surgery, and the force of sneezing opened up the incision. Which isn’t exactly unheard of. The big thing is to avoid making it worse. Which sounds obvious, but people are dumb; and when they just blew their guts out their stomachs…. People are even dumber.