No they aren't, because that is a solved problem. We already have a framework for supporting the many wonderful humans who want to participate in elite sport but due to developmental disorder or injury fall outside the usual human range.
It's called the Paralympics, it is hugely respected and influential, and there is absolutely no reason whatsoever "intersex" as you have it should not be a Paralympic category with all the support, care and attention to fairness that comes with it.
No, the "complexity" they are grappling with is entirely down to the ideological demand that these people who are not simply boring old female people, whether "intersex" (in your terminology), males with DSDs, or jusy plain ol' males who are trans identifying, somehow nevertheless should have the right to be compete within the sports category that also contains the boring old females regardless of whether or not their biological differences to said boring old females give them unfair advantages.