Shielded DC power cable feels like partial speculation because formally it is not shield but just additional (-) wire which touches ground before other (-) and (+) wires for additional safety.
But this info is really useful:
"This damage to the SDI connection can occur when connecting an unshielded power cable to an accessory that is already connected to the SDI output of the camera. If the plus pin is contacted before the negative pin, the BNC cable will close the current circuit resulting in the fatal damage of the included SDI driver chip which itself is not designed to handle such high currents. "
This probably explains what caused the HDMI port damage on my camera when i power my camera and monitor with early prototype 18650 battery enclosure (ground looped connection). That battery prototype has on/off switch connected to negative (-) cable because because it was easier to arrange cables layout like this. I usually connected all cables to camera and then turn that switch ON. And once upon a time camera was turned ON but it was no HDMI signal.
When i moved to batch manufacture i decide to redesign cables layout and connect on/off switch to positive (+) cable, just to match common recommended guidelines for electronics. So lucky to know now that all my battery enclosures are formally safe, and formally seems like protect from ground loop damages.
This is probably the main discovery about ground loop connection damages "mystery" - never connect positive (+) DC power cable pin until you connect negative (-) pin.
Actually it is not so easy to do in real life until you have dedicated switch on positive wire of DC cable, or specially designed DC connector which 100% always connects (-) pin before (+) pin.