I can believe that a switch to NP's as the go-to for routine care might be a good idea. But even if that is the case, you're making a very different argument here. I wonder if you notice the difference. You're arguing that more men in nursing might be beneficial for customers, not that men are being kept out of nursing by sexism.
I believe the same is probably true of tech (that more women in tech is better for customers), if for no other reason than something like half of customers are women.
But these two arguments are very different in their moral implications. When you argue that sexism is keeping women out of tech, this is fuel for the outrage machine of moral indignation, like the Washington Post article above. It is evidence that he industry is wronging its female employees and potential female employees. It is cause to criticize the industry as sick and oppressive (which it certainly is in some cases, most notably Uber).
So I think that this criticism is well warranted in many cases. The question is: where are the goalposts? Is the industry sick and oppressive towards women until it hits 50% representation? I don't think that's a fair expectation.