Thanks!
14. Are there any exemptions (due to illness, disability, other personal reasons )?
The person in question needs to provide evidence of why they cannot learn the language, for example by presenting a medical certificate, a literacy development course certificate or a certificate from a speech therapist. The cantonal authorities or SEM will consider an applicant’s personal circumstances carefully and in full when assessing their language skills.
Sorry. No advice nor anecdotes.
They had to provide doctor’s notes to back up their claims.
I would imagine dyslexia would be the same. If you can provide documentary evidence then it should be taken into consideration. There are concessions made in schools and other exam situations to accommodate dyslexia.
Also, obviously would be required for naturalisation, but what about a renewal of a C-permit? According to the table in this doc , I don't believe there is a lang requirement for renewals, only new first-time C permits?