I thought the term “Altar of Repose” was that on which the Blessed Sacrament was reserved during the Triduum, following the emptying of the Tabernacle at the end of the Holy Thursday liturgy. I’ve never heard that term applied outside of the Triduum. And Ive never heard of the Blessed Sacrament being exposed at the Altar of Repose during the Triduum, although that may be a practice in other places.