To a JW, the word "truth" has a meaning you won't find in any dictionary. For them it refers to their organization and way of life. For JWs, "truth" is fluid and can also be changed by the governing body at any time without prior notice to you. You have the choice of accepting any changes they make or being shunned. There is no middle ground.
Beware of any group that alters the meaning of common words to their own ends.