At no point would the cardiac vitalist have any basis for saying:
"But how do we know that this machine is really cardiac?"
There is no way left (other than ordinary empirical risk)
for any difference even to be defined.

 Same would be true if our question had been
"Can a machine be alive?"
When we ask -- of the man-made, R-eng clone:
"But how do we know that this machine is really alive?"