I've read the UG (I thought) cover-to-cover, and don't recall seeing this. Where did you find it?
In any case, it's always a good idea to call Disney dining a week or two before your trip and have them read back each of your ADRs so you can confirm them. Be sure you check the six primary bits of information for each one -- Restaurant, Date, Time, number in your party, name on the reservation, and confirmation number. If all else fails, they can pull up your ADR using the number.
David