No, the "summer reductions" your thinking of are already built in when the schedule is initially loaded (ie. a popular summer vacation destination that is 10x a day in the summer isn't getting loaded 10x a day in the Fall, it's getting loaded at 4x a day because there isn't demand to fill 10x a day outside of summer).

The current announcement from AA (and other airlines) is them saying they're cutting flights out of the schedule that they had initially been planning to operate this fall but don't have the resources for (ie the route they thought they were gonna operate 4x a day is actually only going to be 2x a day). The demand may or may not actually be there to support the 4x a day AA initially planned for (which could be playing into the decisions on specific routes), but given the staffing/availability challenges AA is facing, they only have the resources to operate it 2x/day.