I am also ugly, short, KHHV, and also exhibit all of the bold characteristics PLUS more.
And while I do agree, I also think that looks determine how you are treated/how you develop.
So for example even if Chad was born as neurodivergent (which is less likley due to high-quality genetics), he and everyone else would hardly know because due to his looks he was treated well. The other characteristics such as anxiety, lack of skills, introverted, odd, inhibited, shy, autistic behavior, etc would be very hard to see or even virtually nonexistent due to his looks. When his entire life is filled with positive reinforcement it negates almost all of these bad effects. It is like a positive snowball effect.
Meanwhile if you are an ugly truecel born with neurodivergence (which is more likely due to shit genetics), the opposite snowball effect happens. You are born ugly, therefore treated like a piece of shit, and have a life filled with negative reinforcement. So all the negative effects of your neurodivergence like the ones listed above are heavily amplified and exaggerated. They become present in your personality and impossible to reverse or remove. Therefore it is also a snowball effect but a negative one.