I think maybe you misunderstood. The post isn’t a semantic argument, it’s highlighting the misconception that hormonal body changes stop after puberty so there’s no cost to waiting to start taking hormones. This is false because the effects of hormones on your body continue to progress throughout your life, though at a slower rate over time. So waiting will mean trans people will have more secondary sex characteristics to overcome whenever they do start a hormonal transition. Waiting too long also makes some changes that we’d really like impossible. For example my hips will likely never widen the way I want them to because I didn’t start hormones early enough in life. For trans masc people their boobs will never go away on their own, so their only option is surgery once they have tits. So waiting doesn’t mean nothing is happening, it just means the default is happening, which for trans people is not desirable by definition.