Non-OA is a 1 year visa, Non-O is a 90 day visa that can be extended in country for 1 year. If you have a Non-OA, you're stamped in for 1 year everytime you enter the country, so if you enter on the last day your visa is valid for, you'll get another year. Probably what you're reading about
Yes, that's fake. In the USA, only the AAA is authorized to issue "Internation drivers permits." There's no such thing as an "international drivers document or license".