We were looking for information ourselves for 2 year old for our upcoming caribbean cruise. The website contradicts what yours states.
All guests over 5 years old who are unvaccinated or do not have proof of a vaccine certificate, must show proof of a lab-administered negative COVID-19 viral test (RT-PCR or antigen) taken within 2 days of embarkation before boarding. Children under 5 years of age are not required to submit a negative test.