I think they're advocating that women can choose for themselves what kind of person to be, and the fact their bodies are capable of gestating new humans doesn't obligate them to do so.

It's sort of like how the fact a man's body may be capable of entertaining others by dressing their penis up in a tiny coat and hat doesn't mean we should bully an entire gender into making that the purpose of their existence, nor does it mean we're advocating for a world without sharp dressed dicks.

Let people live their lives based on who they are, not the abilities of their genitals.