Consider what it would have been like to be in that same condition with a monohull, and you'll get your answer.
You either would have been below deck
getting tossed around like a bean in a can, or you would have been topdeck getting 1000 gallons of water swept over the top of you, possibly getting carried to sea if you were not tied in. Certainly some of that would have made it into your saloon
The owners of this Leopard had the option of sitting inside their salon
, tidy and dry but with full visibility until that rogue wave
came along and blew them out of it. If it hadn't been for that incident, though, they would have come through the storm dry and happy.
It sounds like a storm nobody would have chosen to be in, but if you plan to be in heavy seas a lot, sailing in known difficult waters, then a 39' catamaran
is likely not the best choice for you. There are boats - BIG ones - specifically designed for that kind of passage