I think the hole was never meant to accommodate any finger (even a pinky) but rather just to close off the curve of the ‘lower part’ of the scissors. It’s not the most comfortable position, but it’s a 2-finger operation where the lower part of the scissors rests on the index finger, and the thumb operates the top for cutting action. That curve outside the loop is where my pointy finger indexes the scissors.I keep one in my pouch along with my ST300. It’s perfect for quick snips only.
No like in the image above The little finger (pinky) works as a good anchor point in the hole and you can get some good traction - even for longer snips!My hands and fingers are of a reasonable size, and the little finger fits reasonably comfortably in the hole.