I'm confused... are you just commenting on the name of the website itself or the content?
The content itself is about demonstrating how an LLM/Neural net works using a spreadsheet and is a play on the title "Attention is All You Need". It has nothing to do with using a spreadsheet for most of your use cases.
And the author's comments on the difficulty of doing matrix multiplication in Excel suggest that he doesn't _actually_ believe that spreadsheets are all you need.
The content itself is about demonstrating how an LLM/Neural net works using a spreadsheet and is a play on the title "Attention is All You Need". It has nothing to do with using a spreadsheet for most of your use cases.