Eh, not sure if that applies because it is specifically speaking about evocation. Unless I missed it, I don’t see this priest calling forth or summoning these spirits (as in a séance).
It mentions evocation, but not in a limiting sense, as it says “evocation of departed spirits and “other superstitious practices” of Spiritism”. Probably the most chief among the superstitious practices of Spiritism is communication with spirits, threw a great variety of methods (seances, ouija boards, automatic writing, channeling, etc), so any of those methods must be included in the general prohibition. This spiritist’s method of communication is during a perverted form of the Catholic mass, instead of a seance, but that is a difference of form, not of substance.