My family and I were just on the Norwegian Star cruise to Antarctica last month (January 7-21, 2024). Crew on board the NCL Star told us that in the few years NCL has been operating in Antarctica, NCL has rarely (if ever) made it to all of their advertised ports. According to NCL crew, cancellations are the norm not the exception. Passengers on our NCL cruise were angry too.
On our cruise last month, Norwegian cancelled the stop in Punta Arenas, Chilie, after passengers were all bundled up and prepared to disembark. NCL said the tenders were not strong enough to manage the currents and wind. This claim was made despite the captain saying the weather we were experiencing was typical - not exceptional. Our NCL excursion in Ushuaia Argentina was also cancelled after we had already disembarked. At least we did make it into port. The NCL claim about the "go slow" order is not the reason for the cancellations. That order has been in place for a long-time.
I keep seeing comments that people need to read their cruise contract, which is true, but I don't think the contract language precludes a lawsuit. In this situation, I believe the legal construct, "fitness for purpose", is applicable. Fitness for purpose refers to the standard that must be met by a seller in the course of business. Generally, when a buyer makes known to the seller the particular purpose the goods are bought, there is an implied condition that the goods are fit for that purpose. It appears to me that NCL is knowingly selling Antarctica cruises on a ship with tenders not fit for Antarctica. I documented crew names and recorded an announcement by the captain saying the weather was typical as evidence that NCL is selling a cruise on a ship not equipped for its stated purpose. Thankfully, we did make it to Paradise Bay.
If someone was generally interested in pursuing a class-action lawsuit, evidence obtained during the course of discovery would likely show that NCL has rarely, if ever, delivered the Antarctica cruise as advertised. Because the NCL Star is old and not fit for the purpose of cruising in Antarctica, I don't believe NCL can use the contract language to avoid legal claims.
That all said, Paradise Bay was magical. I highly recommend visiting Antarctica but suggest doing so on a vessel better suited for that purpose or you are likely to be disappointed.