There is a large class of people who are not confident about an autism diagnosis.
They read an article like this looking for clues and discriminators about their autism status, and to better understand where they fall on the spectrum.
When the feedback is: "Don't many people have that problem?", it's not meant as a jibe or an attack on the struggle of autistic people. It's meant to ask: "So how do you tell if this symptom is predictive of autism, and why?"
It's like one of the pages with autism spectrum testing tools says: "If you take all of the tests on this page, you're probably on the autism spectrum." - most people won't diligently spend 3 or 4 hours trying to see if they're autistic, to a degree that is somewhat diagnostic.
The best tests available are things like https://psychology-tools.com/test/autism-spectrum-quotient - for reference, I'm diagnosed, and before I took it, I got a mid-level score, because I didn't understand the comparative degree to which those things were true for me, e.g. "I often notice small sounds when others do not" - how do you know if you aren't aware and ask?
So, it's a bit like the old saw about "If you have to ask, you'll never know" - it's worth seeing a mental health professional and asking them, because they can provide you the feedback that people on the spectrum are critically missing out on.