I got curious and wanted to see what method they are using: I believe they are using data from this portal? https://implicit.harvard.edu/implicit/selectatest.html

Looks like anyone can take this! But I guess that also means... did the dyslexics/dyscalculics self-select themselves?

Edit: took one. There is a demographics questionnaire where you can list whether you have disabilities, dyslexia is in there (but not Autism??)... So it is self-selected. And on unrelated note, I am apparently in the 1% that has a strong automatic preference for physically disabled rather than not-disabled people (facepalm