No, a secret told in confidence is not a proclamation.
What is a Proclamation?
This refers to the public announcement of a thing which is considered to be important to a large number of people.
Hene, because a secret is supposed to be hidden or private, then it is not a proclamation because it is just a private affair between a select group of people that is not supposed to be made public.
Read more about proclamations here:
https://brainly.com/question/25485853
