> you can install one of the numerous alternative browsers that are available and updated for iOS 12
Those "browsers" are more like skins, they can't actually modify how websites are rendered or how JavaScript is executed. So no, the article is correct, you can't install actual browsers from the App Store.
Fun fact: Because of this fact, for a brief moment in history Google actually purposefully caused Google Chrome on iOS to crash when they detected that JavaScript on a site was attempting to perform a uXSS attack[1], because they couldn't actually stop the attack since that would require modifying WebKit.
Those "browsers" are more like skins, they can't actually modify how websites are rendered or how JavaScript is executed. So no, the article is correct, you can't install actual browsers from the App Store.
Fun fact: Because of this fact, for a brief moment in history Google actually purposefully caused Google Chrome on iOS to crash when they detected that JavaScript on a site was attempting to perform a uXSS attack[1], because they couldn't actually stop the attack since that would require modifying WebKit.
[1]: https://bugs.chromium.org/p/chromium/issues/detail?id=841105