What did he answer to all the concerns people here are having about it ?
The easy cop-out answer is that it's hooked up to external power and water and no melacha is done for the pax. A rov unfamiliar with the logistics would probably sign off based on this answer.
The harder answer is that there is rarely enough power or water available as an external hookup and it's typically supplemented from onboard processes, which would certainly be in violation of Shabbos when those are done on behalf of a ship that's majority Jewish pax. There are likely other onboard melachos being done by the crew in violation of Shabbos as it's only being done for Jews.
Extensive research of the port and boat's processes would be required to implement this in a way that's not being mechalel Shabbos.
As for Antarctica, there's close to a 0% chance this is possible to be done properly, but I'd love to be proven wrong.