What utter garbage this article is!
There are more than 300 separate and distinct scientific studies to date indicating that actual transsexed birth conditions are neurologically intersexed as a result of pre-natal neurological development. This is not an open question any longer. As for the spectrum, it does not exist at least not with actual transsexed people as part of it. This sort of nonsense is what has resulting in backlash reactions to formally legal acceptance of women of history and is nothing more than a deliberate attempt to cloud issues well understood scientifically at this point.
While the proximate causes for this developmental issue can vary, the issue itself is understood on a level beyond any reasonable doubt. Further, since the ADA exclusion was specific as "transsexuality not from physical causes" and there is a legal opinion issued by the DOJ civil rights division that clarifies that transsexuality FROM neurological developmental IS covered under the ADA, passing on this bad information serves to prevent those who might need to use that coverage for civil rights protection is downright dishonest and unethical. You read that correctly, if you are classically transsexed, typically defined as having the absolute need to put mind and body in congruence, you are fully covered regarding civil rights under the ADA, not just employment, but public accommodations and housing as well. Pressing such a case might require you undergo some tests, but such tests are readily available now