The exact mindset of the reviewers is something we will never know. They give us a blanket technical rejection with the expectation that we are skilled at our craft and will be able to identify them. I think people would be equally upset If Adobe only pointed out some of the things that were wrong with their photo, and didn't give an in-depth detailed analysis. I personally like the way that they do things, but I highly doubt my opinion has any infuence regardless.
Both rejection reasons could be true. You both could have images submitted that are similar to this one, and there could be technical issues in this image as well.
I can confirm that there are technical issues in this image. Zooming in on the details the edges of the image are jagged. Parts of the image appear to be really dark and hard to make out, They are neither completely solid black or bright enough to make out the details. The graphic appears cut off in the corners. There are various spots that appear blurry. I'm sure the blurry spots are intentional but in my experience Adobe is looking for crisp sharp images. It's much easier to blur a sharp image than to sharpen a blurry image.
It would be naive for any of us to assume that we couldn't have technical issues in our photos. I certainly have plenty of technical rejections.
Genuinely, I wish you good luck!