It's important to note that many of these things can have multiple causes:

Phone anxiety and feeling overwhelmed can stem from worrying about making a bad impression, from physical overstimulation, or from it taking a while to process auditory information.

All of these might be present in autism, and also in ADHD. Many people have both. Most of the social anxiety is not part of the autism or ADHD, but stems from people's prejudiced behaviour which can create a sort of compound trauma effect called rejection sensitivity dysphoria (RSD). RSD can be treated with Cognitive Behavioural Therapy (CBT), which can remove or reduce the anxiety, but you'll still be neurodivergent (obviously 'different').

Becoming overly absorbed in a particular interest for a single intensive session (like playing a videogame for six hours straight) is called 'hyperfocus'. This is an ADHD thing. The key difference between ADHD hyperfixations and autistic special interests is time: I was hyperfixated on video games and built and released 5 mobile games over a nine-month period, but almost completely forgot about it when I decided that I wanted to learn to paint instead. By contrast, my dad's special interest is trains, and that hasn't changed in 70 years and probably never will.

The big flags for autism are being uncomfortable with change and having an expressionless resting face that might look sad or displeased - they're distinctly autistic, where many of the others could be another type of neurodivergence.