Albert Einstein was not as good at math as Henri Poincare, but he did better at understanding relativity, because his physical insight was completely unmatched.No, this is backwards. Einstein had no relativity physical insights that were not already articulared by Poincare. Not until after Poincare died, anyway. Those who credit Einstein for relativity often point to the lack of experimental justification in Einstein's 1905 paper. While Poincare and other derived relativity from the Michelson-Morley experiment, Einstein does not mention it. Einstein's approach is to postulate what Lorentz and Poincare proved.
One of Poincare's key 1905 insights was that realtivity was a spacetime theory, ano not just an electromagnetism theory. So Poincare recognized the need for relativistic gravity, while Einstein ignored the issue.
Carroll also says a lot of nonsense about many-worlds, simulation, etc. At 2:01:00, he says Einstein was right to rail against Copenhagen because Copenhagen is terrible. He says Bohm and Everett interpretations are much better, as they are well-posed scientific theories.
It is sometimes said that QM is the most successful theory ever, as there is a trillion dollar industry based on it. And it is 100% Copenhagen. No one has ever used Bohm or Everett for a practical application.