"would you say overbite = neotenous appearance?"
I never thought about it like that. Is it common for children who have overbite to automatically lose it as they grow up?
"reduce its visibility"
Visibility is a poor way to judge gracility, as faces with less fat will have more visible bone structure than faces with more fat. A better way to judge gracility is bone volume. If we could directly measure circumferences etc. this would be easy, but relying on photos and videos alone requires comparisons with other people in the same shot, which is what the exercise is for. I will wait for your response to the second part.
After thinking about this for a while, I have realized that overbite in some cases may actually be non-neotenous. Incels frequently talk about "good forward growth", or growth of the maxiallary/upper jaw bone. This results in a more protruding profile, which, when coupled with a heavy nosebridge/browridge, results in an adulterated "3D" appearance (see the "3D face" that Chinese Eurocentrists were talking about). I have noticed this with myself; I have an Aryan looking face when viewed from the front, but when viewed from the side, the rather heavy nose bridge/brow-ridge and protruding maxilla are anything but Aryan.
On a side note, I want to mention the remarkably mix-and-match nature of Aryan traits in my brother and myself. I am ectomorphic, gracile, leptoropsopic, don't have facial fat but have heavy features and am not so dolicocephalic, while my brother is endomorphic, is not as leptoprosopic, and has facial fat, but is extremely dolichocephalic and has lighter features.
Additionally, another non-Aryan facial trait you mentioned was deep-set eyes. I have noticed the difference between me and my brother in this regard as well, where his noticeable lack of deep eye sockets gives him a strikingly Aryan eye area, with many even remarking on the "radiant" nature of his face due to that. Although, I myself don't have very deep eye sockets, they are deeper compared to my brother's as his eyes bulge out more.
It seems Aryan traits were distributed evenly among us. How tf is this even possible?