It’s a strange choice, but Universal’s brand of Mardi Gras is kinda like a greatest hits of New Orleans culture/stereotypes. To most, it makes sense because it’s everything they know about New Orleans, but as someone from the area, it is jarring.
The voodoo/witchcraft aspect is very much it’s own separate thing IRL. Mardi Gras much more steeped in mythology and royalty.
im guessing person who designed the facade or is the Tribute store lead, took a trip to New Orleans and connected with Preservation Hall