This is very rapidly heading in a direction that is very not good.
The science paper seems to be talking about ways that 'dom' and 'sub' key into evolutionarily older adaptations and it's confirming in passing that the shift in sexuality is recent, though it frames it as an insight into something that was always true, but there's - there's hints of - things worse than dominants giving orders and submissives taking them - of course this world would somehow manage to invent something worse than masculinity and feminity to replace it -