Twin bilge keels?
In theory twin bilge keels can be designed to be safe for offshore useage. To do so they end up adding substantial weight and wetted surface over an equally optomized single keel with a bulb, and in most cased over even a single keel without one. To one degree or another, depending on the design, bilge keels adversely affects some combination of the ability of the boat to carry stores and gear, the ability of the boat to go upwind, and results in generally less performance than a single foil.
I don''t know where you read that bilge keels are more seakindly, but, as bilge keels are normally designed, that is simply not the case. A single deeper keel would offer greater dampening and a lower center of gravity, both of which would result in a better roll comfort for the single keel.