Actually, Searle's description of the thought experiment does include a "program", a set of rules for manipulating the Chinese symbols provided to the room's occupant. Searle also addresses a version of the contrary position (the pro-AI position, as it were) that posits a simulation of an actual brain (to which I alluded in the grandparent). He doesn't think that would possess true understanding, either.

I think that if we've gotten to the point where we're rethinking whether humans have true understanding, we should instead admit that we haven't the first clue what "true understanding" is or what relation, if any, said mysterious property has to do with whatever we're detecting in our test subjects.

Oh, and: GAZP vs. GLUT.