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Is this for real, like do you really not see the difference? Not tryingto be snarky or sth, just struggle to comprehend this.

You compare apples to oranges here. From a short look at the provided link, i guess it doesn'tcompare at all because it's something completely different?

Link you provided seems to be Samsung or OneUI only, integrated with Good Lock. This seems to collect and present notifications together with the ability to search. Does not seem to be open source.

DoNotNotify allows you to restrict apps to only sending you certain kinds of notifications.

They could supplement each other but you can't compare them as far as i'm concerned.