I'm not trans, so speaking for them (since Himu is gone) "definitively" is kinda thin-ice-y for me, personally but: It really depends on the person. The "discomfort level" of their original gender (trapped in another body) varies, in my experience. Some folks
really do hate their original gender. Some are "okay" with it enough to change their looks:
Not all transgender people choose to have surgery as part of a gender transition,
While others (like this guy, who took their original genders breasts off after breast feeding for the sake of "looking normal") will do gender reassignment to feel "complete."
I think the key take-away from this article that you're feeling doesn't make sense is here:
They both knew they wanted to be parents. After they were married in 2016, they agreed that Sabastion would carry their child -- a decision, Angel Sparks says, that wasn't taken lightly. Like many transgender men and women, they had been taking medication to increase the testosterone or estrogen in their bodies. So to make a baby, they briefly stopped taking their hormone pills.
The couple conceived their son the conventional way, even though their biological roles at the time were not compatible with how they saw themselves.
Underlined line is where you're "you've lost me," I feel. But the bold bit is where it is. They decided they wanted to be parents -- even when they started to transisition -- knew that they couldn't do it if they had SRS, did it in their original genders. Had the child, and then completed. For them, the
dysphoria/pain of being their original gender is "man, this sucks. But I know if I go to my desired gender I'll lose my chance of having a son/daughter. My partner agrees they want a kid as well. Let's do this, and then be 'complete.'"