This is what I found on the web.
What is in the CPI market basket?
BLS has classified all expenditure items into more than 200 categories, arranged into eight major groups (food and beverages, housing, apparel, transportation, medical care, recreation, education and communication, and other goods and services).31 Aug 2023
Now rents are going by 10-15% per year, petrol and diesel never go down over the long-term, food and drink don't go down (well I can't see how they can unless costs are lowered?, which seems unlikely to me. Clothes might come down, but as bloke clothes are a pretty low spend and cost maybe $150 - $200 a year. I only buy a pair of shoes once every three - four years. I wear my undies until they no longer stop my pecker getting caught in my zip, or if I start leaving stains on my trousers.
I don't get it, I think they are trying to bullshit a bullshitter with the measurements they use.