Oy. There's so much incorrectness here in just this one sentence alone. As the mom of 2 young adults, (one male, one female), and 1 teen (trans non-binary), who has actually done P L E N T Y of research on trans people, allow me to explain.
1. I understand you're identifying yourself here as someone who "holds a different point of view" on the topic from the previous commenter, and that you're defending yourself against the label of "anti-trans clicktivist."
That said, it bears reminding folks that being trans has nothing to do with one's "point of view." Being trans isn't a choice, lifestyle, philosophy/"ism," or "different point of view." It's an identity. Everyone has a gender identity - even you. If you're not trans, you're simply not accustomed to living in a world where you have to justify your mere existence, because you're presumed to be society's "default norm." This is one of many social privileges that a person can experience.
2.) You try to prove your point by insisting it's not your opinion, but rather, [that you're] "literally observing material reality from the 99+% of xx bodies or xy bodies who have always been what they are since homo sapiens walked upright..."
There is no "material reality" in what you're saying here. At all. You are aware that intersex people exist, right? And no, it's not just the 1% (or whatever odd, rare number you've heard of) that exist. While there's a small shred of truth to the 1% stat, it's not the whole story by any means. About 1% of babies born (or 1 in 1500) will have such noticeably atypical outward genitalia that they are labeled intersex at birth, but there is a higher number of individuals who actually are intersex, though not classified as such by outward appearance. In fact, many people will live their whole lives never knowing they were intersex.
There are many different types and variations of intersex humans, ranging from XXY (or Klinefelter), to late onset adrenal hyperplasia, to ovotestes, to vaginal agenesis, to hypospadias, to 5-ARDS, to AIS, and so on.
Historically, there have been (and still are) many cultures and religions around the world that recognize and honor more than two genders. Hijras in India. Native American Two Spirits. Sekrata (Madagascar). Femminiello (Italy). Third gender "Ninauposkitzipxpe" (Blackfoot, Southern Alberta, Canada). Metis (Nepal). Guevedoche (Dominican Republic). Travesti (South America). Whakawahine (New Zealand). Sistergirls" & "brotherboys" (Aboriginal Australian). Mahu (Hawaii). Calabai, Calalai, and Bissu (Indonesia). And many more.
It's not just humans, but non-binary sexes occur in other species as well. Trioecious Nematodes, a kind of roundworm, has three distinct sexes. White-Throated Sparrows have four distinct sexes. Butterflies can be male, female, or some combination of both. Some Copperheads and Cottonmouth snakes carry out the reproductive functions of both male and female sexes at the same time. Ocellaris clownfish give birth to androgynous juveniles, who bear the immature reproductive tissues of both sexes, which can and does change over time. And on. And on. Because SCIENCE.