After scrubbing through the video I find that at 35 minutes he claims a neutron star was formed in a supernova explosion between mars and jupiter and was then ejected out to the outer solar system. A minimum mass neutron star would have completely destabilized our solar system if one had formed at the distance of the asteroid belt, particular prior to its explosion, but even if you simulate what one would do if it suddenly existed only at the moment of the explosion onwards on its way out of the solar system, it would literally rip the sun itself away from the outer planets and our inner solar system basically would not exist, it would be a chaotic mess of highly eccentric orbits for the planets that managed to remain with the sun, which would generally not include mars.