No, even though Multiplexing is used, you will not use or require less licenses to be used, since indirect user access to NAV 2013 must still be licensed.
Hindi, kahit na Multiplexing ay ginagamit, hindi mo gamitin o nangangailangan ng mas kaunting mga lisensya na gagamitin, since hindi direktang access ng gumagamit sa NAV 2013 ay dapat pa ring maging lisensyado.