This sounds suspiciously like the problematic of the author function.
To wit: Let us assume that the simulacrum symbolizes a text and that reality symbolizes an author. Naturally enough, at least parts of a simulation will be based on reality, although this will probably entail recombinations / enhancements / modifications of reality. Similarly, any text written by an author is bound to reflect their background and life experience at least in some respects, although imagination may well constitute part of the text. When the the text is written and the simulation is constructed, however, the author is dead, and so is reality. In fact, we might even quote Ecclesiastes whom Baudrillard alludes to at the beginning of his book.