If the article is correct, Cruise bought a sonogram machine for recreational use.
As you point out, not getting a sonogram, when other diagnostic indicators call for it, can rob physicians of valuable data for proper obstetrical treatment.
The article is not about diagnosticians exercising appropriate medical restraint to gather data. It's about a loony star (who also opposes appropriate temporary drug therapy for serious mental disorders) buying a heavy-duty piece of medical machinery to play with at home.
As you say, pseudoscience kills people. That includes the misapplication of technology by unqualified people because they can. In this case, that's where your observation is best applied.