@Remus2I read about that case in passing and it was supposed to have been non-viable RNA fragments.
Looking at your first link:
Correction: This story was updated to reflect that SARS-CoV-2 RNA, not live virus, was identified on surfaces in cruise ship cabins up to 17 days after cabins were vacated on the Diamond Princess.
The second link does not say anything about the "viability" of the RNA, what it does say is:
On copper, no viable SARS-CoV-2 was measured after four hours. On cardboard, no viable SARS-CoV-2 was measured after 24 hours.
(I read elsewhere that the figure for plastic and steel is 72 hours).
I did not bother with the NY Post because I don't see it as a reliable source of information for anything I care about.
The last link says:
A Princess Cruises spokesperson told Fox News late Tuesday that what was detected on the surfaces of the rooms was SARS-CoV-2 RNA* and "not [the] live virus."
The discovery of the viruses ribonucleic acid can indicate the virus "was present" but does not indicate it is still alive.
"These findings were expected because Princess Cruises voluntarily preserved these staterooms for this testing," the spokesperson stated, adding that the findings "do not indicate that transmission of the virus that causes COVID-19, was transmitted via these surfaces."