The last bit can be said about anything. It might be relevant if the notion is intrinsically motivated by an instinctive search for closed forms. "Space" being

The last bit can be said about anything. It might be relevant if the notion is intrinsically motivated by an instinctive search for closed forms. "Space" being emptiness would be isomorphic (dual) to many experiences of limits. In contrast, mystifying the unknown might inspire curiosity at best, reserving free space in the back of the mind, or philosophic arguments at infinitum at worst. The article is somewhere in the middle with its talk around gravitational waves and einsteinian curvature of space, without directly mentioning them.