I'd disagree to be honest, just because yours went in fine it doesn't mean it does for everyone.... You can quite clearly see he did nothing wrong, the bush was greased up and lined up correctly, but it just didn't slide in easily
My insert was a PITA to slide in, but I was a lazy so-and-so and did it without removing the dogbone, but it really did not go in easily. I ended up using my trolley jack to lift it in to place whilst I guided it in