If those people are so reputable, they could some more effort into making their website look not so hideous. But my suspicion is that this is all speculation based off of scientific half truths (maybe land does weigh more than sea, but when you consider how much of the Earth isn't on the fucking surface, the weight difference is negligible, and makes the unbalanced Earth thing seem a bit silly).
What does it really matter if the world ends, anyway? It would be fucking amazing to be on Earth if it switched sides. Imagine the rush: Skyscrapers, buildings, cars, hurtling towards you at Ungodly speeds. That's how I like to imagine it, and I couldn't imagine a much better way of going than hurtling cataclysmically off the face of Earth.