I assume this is AI generated. The AI did not know that signatures (and things like signatures) are forbidden in stock. Also, did you upscale any part of this?
You could argue that the flat look and errors like this are intentionally, but together with that signature, as @Test Screen Name correctly states, you got an asset that Adobe won't accept.
The file type is aqlso a problem. Adobe restricts .png files to images having a transparent background.
The nonsensical text might also be a problem....