So, in reality, dialogue and deception are synonyms according to New Church.
Not precisely. "Dialogue" objectively taken and as defined by Merriam Webster refers to (a.) a composition in which two or more characters are represented as conversing; (b) a conversation between two or more people; (c) and exchange of ideas or opinions...
Obviously, "dialogue" is a precondition for any
eventual evangelization. Folks do have to at least acknowledge the existence of
something before proceeding to debate its merits, logic, imperatives, etc.
Even before Vatican II, the hierarchs and clerics had to "dialogue" with converts to ascertain their sincerity as much as to obtain their consent.
So, objectively speaking, this was not a misuse of the term by the Pope.