you're misreading the comment. this a about filtering the kind of notification from a single app. notifications from a single app are split by category, and yo

you're misreading the comment. this a about filtering the kind of notification from a single app. notifications from a single app are split by category, and you can disable in the phone settings notifications from a single category will keeping the rest for a single app. (though this categorizing is done by the app dev not you, so the dev can mix annoying stuff with the useful)