I believe what he did was to outline, in bullet form, the contents of truth. In reality, it says more to the average person than to say “we have the fullness of truth.” That statement sounds arrogant, ambiguous and does not really tell the person who does not know Catholicism the essence of the fullness of truth.
By bulleting the sacraments, the papacy, the Blessed Mother and the saints, the scriptures, the liturgy, and the other details that he mentioned he explains what we have to the general population. We have to remember that some Church jargon is not understood by the person who is not Catholic and has never been Catholic. When we say the fullness of truth among Catholics, everyone knows what that means. When you say that to those who have never studied the meaning of the expression, they are clueless.
In closing I would also add that he’s talking about men and women who have come into the Church and how they descibe their journey. It would be inappropriate for him to put words in their mouths that they have not said, even though they believe it.
Hope this helps.
Fraternally,
JR