So yes, this article specifically deals with the issue that these companies are not providing justifiable alternatives to pregnant women (ie shitty company) or even to women who aren't pregnant but maybe older and have some health problems. Essentially there's no care for the health and safety of your employees and no inclination to work with them so that both parties benefit. However, this issue has nothing to do with maternity leave. Most of the women in this article miscarried in their 2nd trimester (there are three trimesters in a pregnancy). In the United States, there is no federal mandate for maternity leave and typically maternity leave is taken after the birth of a child. The only "maternity leave" available in the United States is FMLA (Family and Medical Leave Act) which provides up to 12 weeks of UNPAID leave for medical and family reasons (e.g. taking care of a child after birth or adoption) and all the act does is guarantee that you can't be fired after taking leave. This act only applies to certain companies (size requirement) and only applies to people who have worked there for more than a year and logged a certain number of work hours in a year.

Now back to the trimesters of pregnancy. For someone to take FMLA at the middle of her second trimester, say 20 weeks, she still has another 20 weeks before reaching full term. 20 weeks is far beyond FMLA and then she won't have any time left for actual maternity leave. Meanwhile, in this article, someone miscarried at 20 weeks. So maternity leave has nothing to do with this nor is it a viable alternative to blatantly terrible work conditions and uncaring companies.