I don't understand how they're accommodating men.
Focusing on the valves thing, they're made to fit strong people. Which men are more likely to be.
Allowing women into subs is one thing. And many women do belong on the "strong people" group that the subs are fit to.
Making subs fit for physically weaker people is the accommodation.
When the topic was hot, people were concerned about lowering the physical standards.
I don't' really know if subs really need physically strong people, or people at all. Or if it's really a small price to pay, compared to doubling the pool of potential candidates to join the navy. But it's a confirmation of the issues people were raising back then: allowing women, eventually lowers the standard.