They are making flat assumptions and trying to recreate the charts from the government CPI, its also a reddit post and not a serious bit of research which examined their actual methods. It could all just be correlation - who knows? All I know is that prices are rising very fast, and I tend to not believe the government. Food pyramid, Iraq war, COVID numbers, etc.

I think the FED and our banking regulations are the true "bad economics" and if you trust that, just go ahead and leave your deposits in the bank or invest in 4% yielding bonds : P