That is true, but that tide at 187 cm above normal was a 50-year event, caused by an unprecedented combination of wind, tides, and other factors. It covered areas of the city that are not normally affected by acqua alta. Since 2019 the MOSE system has been activated, and thus far it has worked well in spite of all the initial skepticism.
I have been concerned about Ravenna, but glad to hear from Ricky that the city itself was not actually flooded, and the mosaics are unharmed.
In any case, no one knows how long it will take for the region to recover. It will vary by city or town. People with travel plans will have to follow the progress and make their own decision about when and where to visit, balancing concern for the damage and difficulties faced by residents with the local need for tourist €€€ to return (which was mentioned above by Roberto).
If I had reservations in any of the cities in the affected area for June or July, I would definitely be in touch with my lodging host to ask for guidance. If I were planning to visit in August or September I might wait a bit to see how things are going, and then ask for advice, before canceling my plans.