They don't explicitly say they generate summaries at any point in the article. In fact I read it and though this was just some fancy RSS aggregator. The way they describe the "daily briefing" is extremely ambiguous.
In this situation, humans are more accurate, for now, so it's good information to have.
Same as I would like to know if humans self assessed in a study about how well they drive vs the empirical evidence. Humans just aren't that good at that task so it would be good to know coming in.
Just call it Kagi Vibes instead of Kagi News as news has a higher bar (at least for me)