None of the bits in the pointer have been "stolen" though, which is the point of the referenced article, they are all still available to access the full address space of the CPU.
That doesn't mean that they aren’t still there, and don't tell you the type. It’s still a tagged pointer, and because all objects of the same type must be allocated out of the same page (or collection of pages), it still limits how much memory can be dedicated to objects of that type.