There is literally nothing circular about that. You're just saying the same thing twice.
IF women aren't interested in programming, THEN none of them go into programming professionally.
IF women don't go into programming professionally, THEN they aren't interested."
I have 2 better questions to ask:
1) If fewer women than "the ideal" are interested in STEM, then why is that?
2) Why do we think a perfect 50/50 ratio across all fields is "the ideal," when "nature" might not deem it so? (note: this is NOT an "argument to nature")