A paid search engine lives and dies by the quality of results. The article author didn't like the results from Kagi and shouldn't use it. If my friend recommends a restaurant to me and I didn't enjoy the food then that's it. No reason to write an article about why other people shouldn't enjoy the food either.
Why do you waste everybody's time with your comment when you very very clearly only read the first few paragraphs and didn't even think of scrolling down to where it says "Conclusion", in which the author clearly makes a completely different point that has nothing to do with search result quality.
I read all of it, and none of it made much sense to me. It's just letting perfect be the enemy of good. Quite a bad article.