I don't really see where you said the output was "bad," you said it was a compression artifact which had a "swimming effect", but I don't really see any acknowledgement that the influencer had a point or that the transformation was functionally a filter because it changed their appearance above and beyond losing detail (made their eyes bigger in a way an "anime eyes" filter might).
If I've misread you I apologize but I don't really see where it is I misread you.
He's getting his compassionate nodding and emotional support in the comments over there.
I agree that him being non-technical shouldn't be discussion-ending in this case, but it is a valid observation, wether necessary or not.