They have parity because a woman who applies is 2.5x more likely to be admitted compared to man who applies [0]. I think this is probably reasonable, since more there are likely more qualified applicants than spots, so all of the admitted students will be qualified either way.
However, I think it should still be mentioned as one of the key reasons why they have parity, rather than claiming it's simply due to changing the culture and courses, especially if we're asking other institutions to learn from them.
It's likely also because almost all of their applicants are in STEM fields, because that's what they specialize in. So essentially all their female applicants are already self-selected into the hard sciences.
However, I think it should still be mentioned as one of the key reasons why they have parity, rather than claiming it's simply due to changing the culture and courses, especially if we're asking other institutions to learn from them.
[0]: https://www.washingtonpost.com/news/grade-point/wp/2016/03/1...