I can relate fairly easily to the definition of transsexual given in the quoted article, although having started my transition, I do not identify with the constant mental trauma suggested there.
I have a great deal of difficulty with the mish-mashed combination of Kinsey and Harry Benjamin because of the conflation of sexuality with gender identity. On that scale I would probably come out as a six for the gender part but for the fact that he insists that a Type Six has to be heterosexual and desire relations with a man.
Fortunately, many modern clinicians actually reject the terms homosexuality and heterosexuality in relation to transsexuals, preferring simply to note our attraction to men or women.
Those who persist in (wrongly) classifying me by my birth sex would consider me to be heterosexual, but that does not fit with reality either since I am not attracted to other women as a man would be. I self-identify as Lesbian, so where does that place me on the Kinsey+Benjamin scale? Somewhere off the radar.