Do they mean aerodynamic drag here? Otherwise, what’s the remaining 90 to 98% of resistance from, if not drag?
I'm surprised this isn't already "a thing" though, as the interaction of wind and waves have been known about for centuries and clearly a big blocky ship is going to be very much not finessed aerodynamically. The hydrodynamic Reynolds number is very large and I suspect dominated design considerations of efficiency with a limited time (and computational) budget.