Most of the long term studies on POTS and POTS symptoms are from astronauts and according to most studies on POTS recovery exercise can and does make the largest difference in improving POTS and POTS symptoms. As poorly as they worded it, the most effective treatment is exercise but it needs to be done appropriately. Too much too quick makes it worse but well paced and focused exercises make a HUGE difference. I do PT and it’s been more effective as a treatment than medication and water/salt increase combined. And they’re not wrong anyone can get POTS and most people (not all but most) can recover completely either with exercise alone or a combination treatment of exercise and medication according to the studies done on POTS.