It's a perfectly valid question, but no, this law only applies to getting equal access. H/A parking spaces, social security, etc are considered 'above and beyond' equal access, so they do require proof. To board a ride with a wheelchair, or use a GAC to get the help you need, is considered as giving equal access. Of course, if Disney were to go around giving out 'front of the line' passes to anyone with a disability, they could then ask for proof, but they only give front of line passes to Wish kids (which I have no objections to whatsoever).
EDIT: K, you beat me to it! lol. Good to see you around, by the way!