On the Diamond Princess cruise ship, 712 people became infected with COVID-19 and 14 died.
On this ship, 2 are infected and asymptomatic. No evidence of any spread has yet emerged.
All their safety measures are useless? Are you serious?
If you mean by "safety measures" that the Diamond Princess had 2,600 passengers and 1,100 crew mostly from Asia, while the Celebrity Millennium had 500 passengers from North America and 800 crew, then yes.
-PJ