Here is a much better article on the subject, written by another astrophysicist: https://cosmosmagazine.com/space/how-colliding-neutron-stars-proved-all-are-equal-before-the-law-of-gravity
Here is a much better article on the subject, written by another astrophysicist: https://cosmosmagazine.com/space/how-colliding-neutron-stars-proved-all-are-equal-before-the-law-of-gravity
RE: Gravitational waves travel at the speed of light