That's not a repair pin like you see in older USGI (wood) stocks.

In hidden-tang knives, the easiest way to break the (epoxy) bond between the handle material and the tang would be to twist it. To keep that from happening, the tang is drilled and a pin inserted as seen here.

A lot of knifemakers still do this practice today.

Others (including RMK) have worked their handle attachment processes to avoid the need for the pin.