Did said critics happen to notice where he added the caveat, "...or just the first to admit it"? Unless Aykroyd was known to be Asperger's prior to his 2003 appearance on SNL, Elon is correct.
From what I can gather, Aykroyd went public with his Asperger's in late 2004:
https://www.npr.org/templates/story/story.php?storyId=4181931&t=1621243190349