You may not use ANY editing tool to create new image area, objects or features (such as lens flare or motion) that didn't already exist in your original capture
Bear in mind that Advanced rules are entirely results-based: the tool used to attain the result is irrelevant.
In this case, the starfield was considered to be "an added feature": it was nowhere evident in the original sent to us. Such noise as there is in the original is VERY evenly distributed, nothing like the "starfield pattern" you were able to tweak out. Functionally, it's as if you had used a tiny brush to CREATE stars (though we realize you didn't).
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