Any GI issues on ships shouldn't be a worry to anyone other than those on the ship.
GI outbreaks rarely happen on ships. You're more likely to get noro from just spending time at a nursing home.
Also rare is having an outbreak affect a significant portion of the ship.
Look at this year's events that met the reporting threshold.
Only 4 of them. And only one was more than 5% of passengers. But that was only 7%.
Are you on Radiance next cruise? No worries, they'll have it all taken care of before they let people board again.