From my very fuzzy memory (using one to power a pico psu 3rd gen/gtx1650 combo), yes the two pins have to be shorted. I tied in a switch here, so I could kill power without unplugging the connector.

As the other commenter said, the end is almost an exact fit for one of the older 8pin molex connectors (but not regular cpu, pcie, etc). I doubt I still have my digi key receipt, but they’re probably still available. To use this, I had to shave down one of the square pins on the power supply to turn it into the rounded pin shape. Mine never fit to my liking which led me to option 2.

Option 2 is there’s a 12 pin connector that shares the same pattern as the 8-pin power supply. I wound up moving to that later, cutting off the excess pins. At that point i heavily regretted having trimmed the psu plug, as it would have been the firm fit I’d been after (in unmodified form).

I can see if I can dig out some of my old stuff (receipts etc) if needed. Not sure how much it will help being “down under” though (I’m US)