Defiling corpses long enough to give birth would require a cocktail of drugs, hormones, treatments, etc to manage the various ailments/complications of the dying body, and therefore a whole ton of medical supervision.

I also highly doubt the hypothetical child would have good outcomes, in fact they wouldn’t get that far in development IRL, even with the best medical necromancy money can buy. Dying is taxing on a body, then compound the brutalities of pregnancy and its just not happening.

This is just an idle cruel thought suitable for a horror novel, not anything serious. Terrible that this person is an ‘expert’.