Yes I would agree that we shouldn't expect all industries to have 50/50 gender representation, and in fact aiming for such a goal is misguided. However, I am not convinced that the status quo in the tech industry reflects a "natural ratio" so much as other factors (that are worth correcting).
Would you agree that, if the gender disparity in an industry is caused by factors outside of the "natural ratio", then correcting those factors does not necessarily imply perpetuating discrimination? Or put another way, if you are holding a race where person A starts at the 0-yard line and person B starts at the 25-yard line, and you make them start from the same place, you are not actually favoring person A and discriminating against person B, but merely equalizing the playing field?