I believe he was referring to my removal of the three larger buildings as well as the other manmade structures in the background, including the buoys.
I removed them because they were visual distractions and their presence added nothing of value to the image. I also removed a sensor spot above the pelican’s wing and some white dots on the other wing that were more subdued and less visible in the original color version.
I think the removal of all those modern structures simplified the focus of the image and made the scene look more natural and idyllic.
Here is the image with those distractions replaced.