Yes, these pins can be fixed using a riser cable.
Yes, these pins can be fixed using a riser cable.
Considering whether to discard the riser cable or not. It hasn't been tested for performance. Bending the pins back seems possible, but the person who provided it likely removed it forcefully with their GPU.
It would be wise to avoid risking a high-quality graphics card.
Unless you're a skilled technician working on tiny components and really want to spend around fifteen dollars for a new socket, it's best to skip it. You also can't be sure the fix will hold up.