Well yes. You know that, I know that, now this person knows it and is trying to spread the word to others who might not. I don't think they're a complete idiot for thinking male hormones + absence of periods for years and years = no need for contraception. Who knows, maybe they did seek advice and were given the wrong information.
I 100% agree with @coldandheat here - this isn't a TRA, no need for the character assassination, especially of the baby! It diminishes us.
But I think that we need keep our criticism firmly on the ideology, structures and institutions promoting or capitulating to this crap, rather than sneering at individuals who have fallen for it. I see that woman ( and her husband, and even more so her child, at least potentially) more as victims of an ideology than people to be scorned.