The best option is probably "understatement".
Understatement is defined as the presentation of something or someone as being smaller or less good, or less important than it really is. In this case, in the text, women are portrayed as less important than they really are.
I would also say that "stereotypes" are also reflected in this text.
A stereotype is a preconceived notion, especially about a group of people. Many stereotypes are racist, sexist or homophobic.
In this case, there is a stereotype that says that women "must remain at home, because that's their duty ", and this is also reflected in this text.