Implementations of programs must perform reliably
The man in the Chinese Room can't reliably implement a program because he is human and humans are unreliable. The man might get tired, bored, or distracted, and therefore not follow the rule book correctly.
A good implementation must exhibit :
"
a strong causal connection between physical representations of programs and the behaviour they produce."
Because the Chinese Room fails in this respect, it is not a proper implementation of a computer program.
Aaron Sloman, 1986.