Why are you bringing up XXY persons here? XXY is a disorder of male sex development called Klinefelter syndrome in which affected males have the customary male XY male sex chromosomes with an extra X chromosome added. XXY males are born with normally-developed male genitals. However, their testes often are on the small size and they typically will not be able to make sperm when they reach adolescence and adulthood.
More to the point: the testes of males with Klinefelter's underproduce testosterone, meaning XXY males typically have lower natural T than normally-developed males do.
The male sex of XXY individuals is crystal clear at birth - and via the customary kinds of testing done during fetal development too. Boys with Klinefelter syndrome are never mistaken for girls as babies.
Due to their low testosterone and other factors, XXY boys and men during and after adolescence have poor muscle tone, don't develop normal male strength and speed, and they have other physical problems that limit their ability to perform well in sports. Some have impaired or delayed development intellectually as well.
There is no history of anyone with Klinefelter's attempting to compete in women's sports. Nor has anyone ever argued that when males with Klinefelter syndrome do participate in sports, they belong in the female division.
The WA rules regarding the participation of DSD athletes in women's competition apply only to athletes with handful of disorders of male sex development that occur in healthy XY persons who have testes that are normally-developed and whose disorder of sex development does not impair their ability to achieve top-tier physical fitness and to perform well in sports. Persons with the DSDs covered by the WA DSD regulations who are competing in women's athletics have always produced testosterone in the normal range for healthy males at every stage of their development. In fact, many of them naturally produce T in the high end of the normal male range - and some have T levels that exceed the normal male range.
At the time of birth, the testes of the athletes affected by the WA rules pertaining to DSDs in women's competition typically had not finished descending into the scrotal sac. They were usually were born with penises that were minuscule and/or malformed (hypospadias) or penises that were missing altogether. But none of them have any female organs. Their internal organs are the typical males ones: prostates, male seminal vesicles and ducts. None of them have a uterus, cervix, Fallopian tubes, ovaries or vagina.
Other than being in an unusual location at birth, there is nothing wrong with the testes of the XY DSD athletes competing in women's sports. Their testes function fine in terms of producing the massive amounts of testosterone customary for males. In many cases, their testes function fine in terms of producing sperm too. With ART, many of the XY DSD athletes competing in women's sports can father children.