Not sure if that's true or not, but if the planet had a dense, large, rocky core, it could hold on to a thick, massive atmosphere that's far less dense than liquid water, at least for much of its overall volume.
Saturn is a good example in our own solar system - it has an overall density less than the density of water. If you had a big enough bathtub, you could float Saturn in it.
It would leave a ring, though...
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