Apple may or (more likely) may not be complying in terms of allowing third party browser engines, but I don't see how you can argue that not implementing this _outside_ the EU fails to comply with EU law (which applies _inside_ the EU).
That's not to say they shouldn't allow this elsewhere (although it will just cement the Chrome monopoly - actually _decreasing_ competition and solidifying the incumbent's position) but I don't think you can argue that this law requires them to do that.