My reasoning is similar to this answer, but distinct. In line with that answer, any story that is set in an implied alternate history or alternate universe is on-topic, regardless of its lack of science fictional or fantastical elements. However, there are male homemakers and female gang leaders in the real world, so those plot elements by themselves are insufficient. Similarly, the Women's Football Alliance actually exists, so a poster for them cannot be taken as strong evidence of an alternate universe.
However, a statement by the filmmaker on her Indiegogo page offers strong evidence of an alternate society:
As the opening credits roll on black we hear the sound of a football
game on TV and when the TV screen fades in we see it’s not the NFL but
the IWFL – Independent WOMEN's Football League. We’re in the crappy home of the Dandy family, where the three sisters are die-hard football fans drinking beer on the couch and gambling on the upcoming championship game. In the kitchen their husbands cook and take care of the children, their eldest daughter Darla steps out to wash the family car, and all is well in the household - except for a little intruder...
Even though the IWFL also existed, the quote clearly seems to imply that the IWFL has the place of prominence that the NFL does in the real world—indeed, I am not sure whether any IWFL games were ever televised. Further, the description indicates a strong intention of building an alternate society with different traditional gender roles, not simply a description of one non-traditional family in a society otherwise identical to the real world.