I believe it's bogus. However, the clerk/cashier gets a prompt on the screen for "ID required" and will not let them continue until they either hit "ok" or actually view the ID and then hit OK. As they are on camera, they ask for an ID. I guess they don't want to risk their job for some moneygram customer.
I'ld be curious to know if being shown page 7 of the guide (which only requires ID for $900 or more) would cause them to make a phone call. If the software is in error, they won't change it until it is easier for them to change it than to continuously have to field questions as to why they are requiring ID on transfers under $900.