It's not that the person was wrong, it's that the person saw no difference between an accidental death (#1 cause) and death from pregnancy. Look at these causes, and you tell me which type of death a hospital can best actively prevent as a part of the treatment plan and those measures have the most impact:

#1 Unintentional injuries

#2 Cancer

#3 Suicide

#4 Heart disease

#5 Chronic lower respiratory diseases

#6 Pregnancy complications

Think about which type of young patient comes to them with at minimum of 6 to 9 months of warning, so much time to prepare for the "event". Think about which type of patient can leave the hospital well with a completely normal life expectancy. Out of those #6 death options, pregnancy is the only type of event where, if you survive, you have a completely normal life & life expectancy. Given that, why wouldn't a hospital invest the resource?

https://www.cdc.gov/women/lcod/2014/all-females/index.htm

Not if your first question is "why do so many pregnant mothers die during childbirth?" - GP's point is that it's a disheartening realization.

That being said, it's not necessarily true - after all, if X resources would be more effective mitigating cause of death A than cause of death B, then presumably you would want to (from a utilitarian calculus) direct them to A, irrespective of whether A or B causes more deaths.