This video is pretty obviously faked.
Bullets fired from a gun spin because of the rifling of the barrel. The only exceptions are a shotgun slug and very old muzzle loaders. The bullet is made to spin to improve accuracy, otherwise it would wobble around and lose it's trajectory.

I would expect a spinning lead slug to hit and shatter into many pieces, not split in two.
Perhaps a sword could withstand damage from a lead slug but the split into two pieces bit is not right.