Yes it must be wrong, and that's what the whole article is about. We know that gravity can't be so important on small scales because the universe would fall ap

Yes it must be wrong, and that's what the whole article is about. We know that gravity can't be so important on small scales because the universe would fall apart if that would be the case. However, our current theories of physics do tell us that gravity is that important on small scales. So the interesting conclusion is that something must be missing in our current model of quantum physics.