It can most definately be fixed. There are a few different techniques that work. I prefer to simply twist the limb in the opposite direction of the defect. I leave the bow strung when doing this and don’t be afraid to really crank on it. You’ll break your hand before you break the limb. Twist it well passed straight and hold it for a few seconds then slowly relax your grip. The limb can be straightened by doing this daily for 3 or 4 days.
Some guys like to run the twisted section of the limb under hot water then twist it back straight but in my experience, it’s easy to end up with a reverse twist that way.
Ron