I'm not sure that interpretation accurately represents the abilities of someone on the spectrum that is able to do productive work in society. But regardless, not everyone with all disabilities are qualified for all jobs. In this case, whatever the cause of Stallman's unwillingness &/or inability to behave in a way that doesn't make people feel uncomfortable or bullied, it also makes him unsuitable for these leadership roles. While some of GNU & FSF can be laid at his feet, in many ways they became successful despite him, not because of him.