Australia has a National Curriculum, whereas in the US, teaching methods and even what is taught is up to the whim of the states or even the school districts. There is no enforced consistency like there is here.
When my kids were being taught to read (early 2000s) we as parents were specifically told not to use phonics at home. We ignored that.
Much more a feature than a bug of the US really. That way when its screwed up, it only effects some kids and if some jurisdiction gets something right, others can copy. Imagin the ******** fights we'd have in congress if we had a national curriculum. CA and TX Reps would come to blows.
Aside from that its only partially true.
Federal funding comes with strings attached, part of this story is that This method of teaching reading had to fight to get that federal funding and thus some of the versions were modified to include phonics.
Most states also have established curriculum of one sort or another, there's a fight about that in FL right now. Which is roughly the equivalent of Australia establishing a national curriculum.