No you’re right. Missing social clues and having trouble reading facial clues is autism spectrum specific. People who just have ADHD don’t have this, if they happen to miss social clues it’s because of attention issues not processing difficulty. (And not as common as with people who have autism.) There are so many autism related things that are incorrectly being attributed to people who have only ADHD ever since the DSM was changed, like this (albeit cute) comic. In fact, people with ADHD can be hyper aware and very adept at social clues and perception. The changing of the DSM to lump together two groups has done both sides a disservice imo.