I haven’t seen anything on this, but would not be surprised. With thousands of people, with one or more pieces of luggage, getting on and off a ship each week, it would be more surprising that any ship doesn’t have bed bugs from time to time. Bed bugs can get picked up in luggage at a hotel, on a plane, at the airport, in the trunk of a rental car, etc. and transported to the ship.
https://www.cruisecritic.com/articles/are-there-bed-bugs-on-your-cruise-ship