From your argument, based on decisions women make, they contribute less to the company, and ought to make less than men do.
Therefore, the wage gap is not a problem isn't a problem that needs fixing. Stop dog whistling.
You're really begging the question here. You're assuming that companies do pay the women less regardless of their contributions to the company. As I have said before, there are dozens of studies out there, and you can find evidence for and against the existence of a non-justified gender wage gap.
> Research on the wage gap doesn't conclude that these causal factors morally justify the wage gap, because they don't.
That doesn't make sense. If adjusting factors for contributions to the company reduce the wage gap to zero, there is no wage gap and there is no moral justification needed.