This isn't as outrageous as they're making it sound. =/ They're not saying Earth doesn't exist, just that the area around us is less dense than most other regions of space. Who knows, maybe billions of other places are the same, and even have planets in them.
Let's not forget that all matter in space is drawn to all other matter by gravity, so the fact that Earth exists in a place where there's little surrounding matter, it's probably because it's all already been absorbed into the Earth itself, the moon, sun, galactic center - there's plenty of places it can be, it's not just 'gone'. Or, because matter is accelerating away from a central singularity, laws of inertia state that objects of different mass will move at different speeds even if they are given the same amounts of energy, meaning there will be empty places where matter has already left but new matter has yet to come.
Nowhere does that article say that Earth is the only place this can possibly happen... I think they're putting Earth on a pedestal (again) by going against Copernicus. >_>
Odd that they'd also tell on themselves. <_<