The quote was about icebergs and No! Flotation of a body is a function of displacing its own mass of water, it doesn't matter if it's an ice floe, (thin and flat) or an iceberg (floating mountain) It is still govererned by the same rule, approximately 90% of the mass below the waterline! no matter the shape? To cause an iceberg to flip would require a force to lift the subermerged portion which is the significantly larger proportion? Hell, the Titanic couldn't do it, it came off tragically second best. Just put an ice cube in a glass and measure its displacement,then scale it up. Archimedes was not wrong.