Just read up on the Dutch cases and it appears only some details of some cases were released (900 partial released of 30,000 cases between 2012-2021). Of those 8 said their mental illness was the only factor leading to the request for euthanasia.
This leaves somewhere between worst case (8/900) 0.8% and best case (8/30,000) 0.03% of cases you mention here, where autism or other intellectual disability specifically led to a person being euthanased.
My intention is NOT to take the importance away from 8 lives potentially unnecessarily lost, but only to put the problem into relative terms. If I was in a dire position and suffering, I would want this option available to me.
The paper itself, which is linked in the BBC article, is quite a read too Original Article