Well, ANY cable is repairable. It is just a matter of finding the damage. Since you know where the pinch point is, that should be pretty easy. Strip off the insulation, find the cut connection, strip that on both ends, splice in a tiny jumper, solder it on both ends, cover those, then cover the whole cable again.
As for the covering- DO NOT use electric tape, at least not in the outer layer. It simply will NOT hold up over time. One tricky thing is that the best cover is heat shrink tubing and that only really works when there are no connectors in the way. If you can remove the connector pins, then you can get a suitably-sized piece of tubing to the area in need of sealing. That is the "proper" way. Anything else will be much less betterer... but I have been known to use liquid insulator or a special kind of self-fusing rubber tape:
https://www.amazon.com/gp/product/B00HWROO7Ehttps://www.amazon.com/XFasten-Silicone-Fusing-1-Inch-36-Foot/dp/B01N7KC62D