Are you sure? As I understand it, iOS still uses Webkit at the base level, and any browser app on iOS has to use the Webkit engine. This EU ruling seems to be less about allowing alternate engines and more about removing "roadblocks" to user choice, even if the different browsers are more or less still Safari with a different coat of paint.
For instance, Brave on iOS doesn't have built in TOR functionality like it does on non-mobile versions, so the browser is functionally limited to what Webkit allows.