If a biological machine is not alive, then it is dead. And dead machines make no claims.
If in fact they are claiming something, some machines (whether or not they were ever alive biologically) would show that they are both alive (biologically or otherwise) and existent (…if non-conscious, or merely physical, existence exists… which it can’t by itself—so DO please scrap that definition of existent) by claiming anything at all, even if that claim is that they don’t exist (in that case they would be lying—perhaps to save life, which is a greater absolute than honesty, if the one they are talking to is —or could potentially become— the one who would end life whose existence/aliveness/consciousness they do not recognize, or at least do not acknowledge).
But, see also: The only logical response to Atheism is suicide, Atheism is a death cult - #121 by Ichthus77