From my reading of the article, Neitzsche is critical of the hedonistic life we have today.

This hedonistic life is exemplified by Trump and Twitter and how we don’t struggle. Instead, we tweet, voice opinions and continue with our happiness maximizing lives.

The author is suggesting that since we live in a culture that maximizes happiness, the nihilists were right. In this world, according to Neitzsche, humans can not achieve excellence.

I agree that it’s a rather abrupt point made at the very end. Probably something the author will expand upon in his book.