The tech industry has had decades of growth, profit, and innovation to show for its male-dominated culture.
Thank you for providing a stellar example of post hoc ergo propter hoc reasoning.
So where is the comparable evidence that gender diversity would produce even better results than that?
First of, you haven't provided evidence that those results are causally linked to the lack of diversity; you've only shown correlation. Second, take a look at this: https://www.mckinsey.com/business-functions/organization/our-insights/delivering-through-diversity