The poses are sexist in the sense that they perpetuate this stereotype for female characters. They contribute to the idea that female characters must look sexy in order to be interesting or appealing.
I have some layered objections to this.
Fist of all stereotyping is not a binary but comes in degrees. Some games, like Overwatch, use stereotypes as more central to the characters looks and behaviors. This is a good thing for that style, stereotyping is what helps us identify with the characters. In the case of D:OS2 the use of stereotyping is very mild in comparison.
Secondly, both the male and the female characters in D:OS2 are made very attractive on purpose (except for the weird faces?). Attractive does not mean sexy. For most characters they use the general stereotype that elegant/stylish females are attractive and males are attractive when looking dominant/cool. There is nothing wrong with this approach and the females are not being singled out in the slightest here.
If you don't like this approach, or if you are intimidated by attractive men/women, or if you feel a game is more authentic with less attractive people in center, then that is perfectly fine and I will stand by your opinion. But don't try to paint this as sexism or oppression of women, because it's not; it's simply an artistic style that you personally don't enjoy.
