Imagine an actor saying following:

So, this is a fiction…

All the characters are based on real life.
I will tell you only truth,
the whole truth
and nothing but the truth,
so help me God.
The idea is to put the notion of simulacrum into wider context:
“The simulacrum is never that which conceals the truth – it is the truth which conceals that there is none. The simulacrum is true.” (Ecclesiastes)