The author expanded the topic into a whole book: https://www.amazon.com/Clean-Science-Skin-James-Hamblin-eboo...

It's a fun read; it's a lot more focused on the microflora on your skin and the health effects of regularly wiping them out than just "not showering".

I shower at most once a week, without or just a little soap and/or shampoo. Everything is fine, what's in the article is true.