I've been previously chastised for making assumptions due to lack of information, so I am only making conclusions based on known and published information now. So far, we've been presented with two female characters, therefore I am only commenting on those two women I've seen.
It's actually 3 female characters, a little girl, a young woman and a middle-aged woman and we've seen maybe just like a dozen characters in total so it's not like women are being deliberately excluded on this point.
Equal representation of genders in art is not the product of intentional bias or political agenda. It is a representation of reality as it has been observed both in the present and the historical past.
We're not talking about "art", we're talking about a video game based in history.
Unless your specific sources tell you that there were no female citizens, female workers, or female slaves, then the game's presentation of these groups has been biased because so far of all the numerous women that have lived during the Hellenistic age, we've seen all of two, and they are limited to the higher social classes that the game's characters seem to be drawn from.
Athens quite literally excluded women from citizenship and it was similiar with other Greek city states. Roman women had a limited citizenship, could not vote, stand for office and the freedoms they did have were highly reliant on the status of the men they were affliated with, such as their father or their husband. Therefore it makes sense to make the Citizen a male.
Freemen(not "workers") are the source of manpower in this game. Women had marginal to no roles in the armies of Antiquity(and the rest of history) so having a women represent Freemen simply makes no sense.
In a similiar vein Slaves produce money, meaning that these slaves generally reperesent the slaves working on the farms or in the mines which were overwhelmingly male. Female slaves were primarily used for domestic use such as housemaids, concubines and other servant roles, with the notable exception being female slaves used as prostitutes.
So the slaves that were specifically used to create wealth were either male working in the fields or mines or female slaves working as prostitutes. Take one guess why a male icon is used.
I'm deeply sorry that you feel under attack for this, because Paradox has in the past gone to great lengths to be gender inclusive in its presentation (specifically with Stellaris, and with EU4's Women in History expansion) so this reversal of direction in graphical representation has come as a bit of a disappointment for me personally.
EU 4's Women in History DLC(not expansion, thank god), is entirely optional, which is good because it basically shoehorns female rulers and heirs into your game.
To be entirely honest I wouldn't mind if the icons displayed both men and women for every pop icon but at the same time it's should not be in any way suprising that men take the center-stage in a historical game taking place before 20th century.