A Squared:
The approach charts for both R18 approaches contain the note that the procedure is NA at night, which seems to support your presumption.
I can only speak to the LOC procedure because it is the only one I researched. Jeppesen was correct when Amendment 2 was effective. Amendment 2A removed the blanket restriction by authorizing at night provided the PAPI is operating. Jepp failed to correctly update the chart. They may have a Jeppesen chart notam on that, I don't know.