The higher-order reason that it's relevant is that there's something of a moral panic going on about medical therapy for transgender youth. While this particular case (assuming that the news story is accurate, of course) seems like an entirely unjustified prescription that's also entirely irrelevant to any medical gender transition, there is absolutely a push to try to get doctors to be unable to prescribe estrogen or testosterone for children under any circumstances, and most of the people pushing this seem to have trouble using standard/well-accepted terms for transgender people. So, it's a reason to take the claim about estrogen's side effects with a grain of salt, in much the same way that you'd be at least slightly skeptical of claims about Linux from someone who insists on spelling it "LINUX" - it's a sign that they might be getting their information, in turn, from an unreliable source.