To be pedantically clear: the analogy from Wittgenstein was (IIRC) about other minds rather than metaphysics generally. I’m editing it slightly.
I’ve had Christians use the concept that we can’t verify the existence of other minds to argue that naturalism has no foundation for truth. I suspect that was somehow derived from here.
Well, the problem of other minds goes way back, certainly it predates Wittgenstein.
The problem of other minds is quite general. If a Christian implies it’s a particular problem for naturalists, they’re misinformed. I believe the proper answer is that we operate by analogy, using abduction (inference to the best explanation). We know what goes on in the case of our own mind, and abduce that the explanation of similar behaviors is caused by other minds.
This is a rational and fully naturalist explanation.