Yes ignore the upgradeable fares for NAmerican flights and as long as you book a T+ fare you'll be fine for the summer promo. I never use this setting when booking and instead just look at the J seat map and one of the sites that will show me R inventory, though when booking too far out none of these tools are much good when using the 7, 4 or 2 day window where intuition is the only real "tool" one can use.