also re bookings
https://www.flyertalk.com/forum/members/luxury.html
was a regular on luxury hotels forum for 7 years before becoming travel agent, i think speaks native fluent Japanese

"won't accept a solo" or simply charge 100% single occupancy supplement etc when per person rates?
most properties (in world), some of which run thousands a night for 1BR, charge based on room not per person
would be odd if any property required a minimum number of guests (not cost) in a room, vs a maximum
laws vary, also in some muslim countries

any service establishment anywhere could always deceptively discourage a booking for various reasons, and can not always find out

walking guests is relatively common even at luxury hotels, and how they choose which guests to walk (not buyout) may not be.. ideal