iOS third party browsers like Chrome are using the same approach, by using NSAllowsArbitraryLoads option, the same you posted from your link.
You can see it here:
https://gitlab.collabora.com/web/chromium/blob/master/ios/chrome/app/resources/Info.plist
As a developer I don’t have any control if Apple blocks traffic coming out of your application – it does not matter if you are opening website inside your app or doing regular HTTP request.