RMS lacks the self censorship and political intuition to not say what many think but know not to say. I disagree with him that " having a child with Down’s syndrome to having a pet." but that's because I've had experience with a neighbor with down syndrome. However, I know many people think that, they just are politically savvy enough not to say it.
It's unfortunate that in today's society, people condemn people like RMS who are not neurotypical for not behaving neurotypically and try to cancel him while at the same time, those same people claim to celebrate diversity.
The term neurotypical doesn't have to be scientific to have meaning. The term is very strongly associated with autism and ASD, and that's the context in which the term was used here. Using an existing, loaded term in reference to a person's behavior, prefixed with a "I'm not diagnosing any conditions," fig leaf is disingenuous.
Personally I am inclined to avoid the term "neurotypical". Although the term is popular, it is unclear what exactly it means, and the scientific basis behind the term is questionable.
That said, RMS clearly displays traits consistent with the broad autism phenotype (BAP). That's not a diagnosis because BAP is by definition not a diagnosis – it is defined as a subclinical condition, and by definition you don't diagnose subclinical conditions.
It's unfortunate that in today's society, people condemn people like RMS who are not neurotypical for not behaving neurotypically and try to cancel him while at the same time, those same people claim to celebrate diversity.