For those who don't know about shadow stats, here's a good explanation of the issues with it, and why their numbers are off https://fullstackeconomics.com/no-the-real-inflation-rate-is...

> Based on my conversations with Williams, I think I now understand what he’s doing: he’s misinterpreting a cumulative 20-year change in the measured price level as a change in the measured annual inflation rate. And that caused him to overestimate that annual change by at least an order of magnitude.