Indeed, this is just a guy spreading fear to sell his book, which coincidentally has an ad at the bottom of this crappy blogpost.

Anyone watching monthly CPI numbers is aware that the BLS changed the basket of goods used to calculate inflation as well as using a single year of data instead of two years. The BLS communicates these changes months in advance, and all the big banks/funds update their models accordingly.

https://www.bls.gov/cpi/notices/2017/methodology-changes.htm