Sorry, but you misunderstand. I fully agree that MtF TSs are females in the wrong body, even before HRT and SRS. In fact, it is so intolerable to be perceived as a male that they change this. Full time. To everyone. Despite the consequences. The paragraph you refer to speaks of TSs who find it so intolerable to be male, that they do transition to live as women full time, with legal name changes, in front of everyone. This was not just meant to describe GGs.
Yes, I know this. My own SO is gender-fluid. He used to identify as a crossdresser, then as bigender, then as gender-fluid, and then as trans-gender meaning someone whose gender is not part of the gender binary. This means that my SO does not identify as a female (females are the other end of the gender binary). Else no doubt my SO would transition. Most of the time my SO lives as a male (this is why I refer to him as "he"). When he is dressed, I refer to her as "she" and I call her by her female name. But, my SO does not feel torn in two, pining away to dress when it is his choice to present male. Nor does he resent it when I dress up (the rare times that I do ... we just don't have that lifestyle ). I think there is no inner pull because my SO has fully embraced everything s/he is, and he knows she can dress whenever she wants to.