Why would it?
Depends - the 2022 covid protocols were described like this in feb:
"The only mandated rule will be players or staff from the same club cannot congregate in indoor settings in groups of more than three".
NRL players get big win in new COVID rules
NRL players will be allowed to attend weddings, funerals and dine out with their families without seeking permission, with COVID-19 protocols to be relaxed.
7news.com.au
I expect a cruise boat could be an indoor setting depending how big it is? The reason for the 3 person limit is pretty obvious and we all know the Covid record of cruise ships. I'd be surprised if the club gave the green light to something like this but all speculation for now I guess, just hoping there's nothing in it because this game was set to be a big launch pad for Manly's season.