The researches provided are limited in that they don't define the population or gender as a whole. It's even explicitly stated in the 'research' itself that it isn't to be used as an accurate cover in general x_x
How would you model it, then? Certainly in the Wild West fiction Rimworld draws much of its inspiration from, relationships are usually initiated by the men. For what it's worth, I don't think the exact numbers really matter -- I think it's more important that the numbers feel believable, and in that regard, I think Rimworld models things quite well (admittedly as a cis/hetero white male in a Western country).
Generally just by snipping part of the code so that it's neutral.
I've nothing against the code despite what's written in the article because it's malleable and able to be changed and it's more like a skeleton construct here with culture and stuff, so less or no fault at all unless the developer really states it that way [I'd be disappointed in the tiniest bit though]. (Wherein western usually means 'countries to the west of the Meridian, as far as I understand it, it's also VERY different despite the general idea being 'from America or such')
So...it's more like 'added research can help, especially social research and such
'. Generally just making the code being neutral at the moment until more time can be put to it. Yeah it's believable, but there is the note of an international audience so...it'll feel very off when those numbers are presented in that way (although the article is lacking in its openness), although it is quite minor, along with that it's sensationalized by the article. >.<
Right now, I don't mind it because it was never said to be as is. It's like judging the developer because of what he researched and 'oh my goodness whyyyy'.