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That works the other way too. You will also have a lot of people reporting they do not have ADHD or autism when they actually do.

What matters for those type of surveys is how many people report struggles. If someone struggle with attention but does not have the exact number of symptoms required for a formal diagnostic, they are still struggling.

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ok, but the whole grand parent comment is a comparison to the global population. Those global statistics are not self reported, they're official diagnoses so will also be missing "people reporting they do not have ADHD or autism when they actually do".

That people struggle is an important statistic, but shouldn't immediately be counted as ADHD or autism. There can be other factors at play.

Yeah, but the questions were not about whether one has symptoms or struggles with some:

"I have a concentration and/or memory disorder (e.g. ADHD)"

"I have autism / an autism spectrum disorder (e.g. Asperger's)"

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