Read the fine print, dude...I didn't write "as much as the Earth weighs," I wrote "as much as a planet weighs." Even accounting for a high-density object permitting closer proximity, you'd still have at least a Mercury's worth of mass to lift off the ground.
What is your problem? Dude?
The bottom line is that the denser the mass, the less that is needed. BookaT mentioned the idea of a super dense mass. Such things are in our universe, just not on Earth in any quantity. If there were a way to assemble a mass of, say, concentrated neutrons as found in a neutron star, it would merit consideration. If there were a way.