Articles like this are (IMHO) ableist and come from an extremely neurotypical perspective. "Just practice social skills" to me is like teling depressed people "just go outside and touch grass".
There's not a single mention of ADHD or autism in here. My own understanding of this has evolved over the years.
The first stage is to understand introversion / extroversion as simply to not like / like socializing, people, large groups or whatever. This is a shallow and pretty inaccurate understanding, one many people such as myself chafe against. I consider myself an introvert but like certain social activities so these labels never seem to quite fit.
The next stage is the "social battery" understanding of introversion / extroversion. That is, social activities will either drain or charge your "social battery".
After this you start to ask questions like "why does X drain my social battery?" and "what does draining a social battery really mean?" and you start to realize you're still describing symptoms, not causes.
The key insight is that something drains your social battery because you're masking [1]. So-called extroverts don't need to mask. So-called introverts do.
Yes, you can get better at following social norms and develop coping strategies for large groups, socializing with strangers, etc but all you're really doing is getting better at masking. That can be useful because it can change how other people respond to you but it's a bit like telling a depressed person to "just smile".
[1]: https://www.autism.org.uk/advice-and-guidance/topics/behavio...