A huaca can be a place honored such as a high mountain pass, an origin or emergence or place of creation (pacarina), a place of traditional significance such as a spring, a mountain top (apu) where rain and water originates, an astronomically aligned location, or a place of historical or mytho-historical significance.
The European conquerors considered huacas to be idols to lesser gods than theirs, but they could not easily destroy a mountain or even a rock with their primitive technologies. If they suspected there was gold inside, they might change the course of a river to wash away an adobe burial mound, as they did at Huaca del Sol.
The Emperor's New School changed huacas into underground guardians of treasure a la trolls, dwarves, or leprechauns. And when Kuzco and company captured a huaca, it turned out to be a fraud--a human pretending to be a spirit.
So what do we learn from this episode? In Disney's Inca-world, deities have material goals such as hoarding gold and retrieving gold masks. That would be pretty crass, especially for a supernatural being, but not to worry. Since every Inca deity so far has turned out to be false, it doesn't matter if their goals are selfish or greedy. They don't exist.