Well, the publishing dates for Mushroom releases are consistently incorrect. For example: True Colours says 1979 on some issues instead of the correct year 1980; 1976 instead of 1975 on Mental Notes (vice versa on Second Thoughts);and 1984 instead of 1983 on Conflicting Emotions. Yes, I love trivial details, lol.
P.S. Escapade was released 1983. Secret God - I too have a Mushroom Classics issue of the album and it says (C)1994. The first date usually refers to the year it was first published (e.g. (P)1983) and the second date usually refers to the date it was copyrighted - either the original year of copyright or a more recent date where the copyright was renewed (e.g. (C)1994 with the Escapade album).