My admittedly amateur reading of this is that while it does promote competition, it also explicitly allows what Apple is pulling in the EU with its signing/review requirements for non-App Store applications. So no need to circumvent, they still retain control over what code is allowed to run on iPhones, albeit subject to restrictions on what reasoning they're allowed to use to refuse to sign an app.

How is it different to what Apple’s done in the EU, with allowing for third party app stores there.