We cut down the Aucuba yesterday, but I did not have a camera handy. The image here shows about what we saw. The small branches near the top were woody, and the small core was a black. As we cut into larger branches further down the black core increased, until at the very bottom the largest stocks are very woody, tough, and all black.
After removal, we can see better and much of what is in the original photo is from healthy green suckers from the ground. It is possible that that two large branches are still coming from the roots of the sick plant. We will see if they survive. I cut a couple of the green branches nearby, and those were softer, yellow/green inside, and moist -- like a healthy plant.