This is the email they sent me:
Dear Valued Guest,
We have an important update to the itinerary for your upcoming voyage aboard Nautica. Due to the uncertainty surrounding access to ports in China, your cruise will now conclude in Keelung, the port for Taipei, Taiwan.
To express our appreciation for your understanding with this change, we will be providing you with a 20% discount to the cruise fare reserved for your voyage.
Guests with airfare that has been reserved through Oceania Cruises will automatically have their air arrangements revised to depart from Taipei at the conclusion of the voyage.
They have already credited me the 20% but have not changed my air as yet.