“Wicca” as such is a modern construct, although it does hark back to a form of debased pagan belief system.
As a new “religion” I dont suppose the Catholic Church would formally declare it false anymore than they would formally declare shintoism false. Warnings against occultic and demonic practices often associated with Wicca are made however.
As a general rule, of course, all faiths that deny the redeeming truth of Jesus Christ are considered of necessity to be false.