Update: it traces back to a survey performed by Deloitte, a London based accounting firm. This is solely for business purposes as far as I can see and is not representative of the actual percentages.
So I found where the 53% came from and it’s an article from an occupational therapy consultant and the link to the article they reference for that particular number is a software company. No scientific basis so far
Disability and Inclusion for Gen Z: Supporting the Next Generation of Workers