Here's the lead-in for the story:
Do you want an expected return of nearly 6% annually above inflation but also want to be guaranteed to beat inflation in a worst-case scenario? Until now, I would have responded “only in your dreams.” But today, that dream is a reality. Here’s how.https://www.etf.com/sections/features/allan-roth-how-beat-inflation-handily-risk-free
the tool cited is here:
https://www.depositaccounts.com/tools/reduce-risk.aspx
The author substitutes TIPS and diversified stock index fund real yields for CD and index fund nominal yields to make his point.