You're arguing against a straw man. The article implies that the boxes are driving the decrease in infant mortality. The OP points out that this is ignoring the global decrease in infant mortality. The OP did not assert that the boxes made no contribution to the decrease in infant mortality.
> Also, for gp comment -- nanny is a odd way to spell welfare.
I genuinely don't understand your point. "Nanny state" and "welfare state" are synonymous, at least in the U.S.