Good. Now we can then turn back to the sutra itself instead of discussing personal matters.
"Then the assembly there all saw the daughter of the nāga king instantly transform into a man, perfect the bodhisattva practices, go to the vimalā world in the south, sit on a jeweled lotus flower, and attain highest, complete enlightenment, become endowed with the thirty-two marks and eighty excellent characteristics, and expound the True Dharma universally for the sake of all sentient beings in the ten directions."
Even before the perfection of the bodhisattva path the naga princess turned into a man. Why? As Shariputra reinterates the five hindrances, "Moreover, the female body has five obstructions. The first is the inability to become a great Brahma. The second is the inability to become Śakra. The third is the inability to become Māra, and the fourth is the inability to become a universal monarch (cakravartin). The fifth is the inability to become a buddha. How can you with your female body quickly become a buddha?" Although it seems that the intention of the sutra is to refute this as a lower view, actually it explicitly says that the naga princess transformed into a man. So it actually confirms it.
In the 23rd chapter it is also said, "If there is any woman who hears and holds to this chapter ‘Ancient Accounts of Bodhisattva Bhaiṣajyarāja,’ she will never be reborn with a female body." Why? Because it considers male body to be better.
On the other hand, in the Vimalakirti Sutra the essentialist view of sex is clearly refuted. "The goddess said, “Śāriputra, if you were able to transform this female body, then all females would also be able to transform themselves. Just as Śāriputra is not female but is manifesting a female body, so are all females likewise. Although they manifest female bodies, they are not female. Therefore, the Buddha has explained that all dharmas are neither male nor female."
The Nirvana Sutra actually talks about how Shakyamuni was also a female buddha, "I also manifest myself in Jambudvipa as a female Buddha. People see this and say that it is strange that a female should attain unsurpassed Enlightenment. The Tathagata, after all, has never once been a female. In order to subdue people, I manifested as a female." And the Nirvana Sutra also points to a transcendental meaning of male and female (after a series of degrading remarks on females), "If one does not know the Buddha-Nature, one cannot be called a man. Why not? Because one does not realise that one has the Buddha-Nature within. Any person who does not realise that he has the Buddha-Nature is a woman. If he does so realise, he is a man. If any woman knows that she has the Buddha-Nature, she is a man."
It is true that the Lotus Sutra promises the attainment of buddhahood to practically everybody. However, it is neither a clear statement of universal buddha-nature, nor is it a proclamation that there are actually buddhas in female form.
"While teachers of the middle way, mind only, transcendent wisdom, mantra, and other schools may have their own assertions, the fulfillment of those intentions is the same. There is not a single thing that is not contained within mind."
(Gampopa to Düsum Khyenpa, in "The First Karmapa", KTD Pub, p254)
“If you recognize the world of appearance and existence as the mind, realize the mind itself as empty, and have no grasping at the superiority of your realizations — this is the ultimate view."
(Chegom Dzongpa, in "The Book of Kadam", Wisdom Pub, p609)