A little boat like this won’t be hurt by waves. It will be like a bobbing cork in rough seas. The lines, masts and sails will be far stronger than they need to be, given the small size of the mast and sails.
The biggest risk is getting tumbled into sargassum weed or other floating debris. I assume the keel and rudder are made to glide over seaweed without snagging. That could be a show stopper. But wind and waves won’t kill this thing. Send it backwards for a while, yes, but not destroy it.
But if it gets tumbled up in waves, and wraps some seaweed or netting etc around the mast, it’s game over.
Retractable telescopic mast? no lines to snag, might have to have a sensor to transmit if its become too top heavy or a vid camera, then the mast simply pulls itself down through the hull, actually it could go right through the hull in its own channel. Carbon fiber golf club shaft or titanium with a carbon fiber wrap? Not big enough to need lines, nut I would researched into an airfoil instead of sails like what Jacques Cousteau used.