The squishyness you refer to is because categorizations like what is a planet or a continent are not objective. Pluto was initially considered a planet, but whe

The squishyness you refer to is because categorizations like what is a planet or a continent are not objective. Pluto was initially considered a planet, but when the number of similar objects discovered kept growing, astronomers had to either categorize all of them as planets or introduce a new "dwarf planet" category. Similarly, I wouldn't bet on this "missing continent" being actually accepted as a continent, but maybe they will introduce a new category for "mostly submerged pieces of crust that are thicker than oceanic crust but much thinner than continental crust" - pseudo-continents?