I think he refers to the fact that those categories have their inflation higher than CPI. CPI weights changed in 1980, and seemly when using old weights the CP

I think he refers to the fact that those categories have their inflation higher than CPI. CPI weights changed in 1980, and seemly when using old weights the CPI is 10% instead. I've read (I didn't checked with all details, I don't live in US so it is not that relevant to me) that a major change is that the cost of having a shelter had its weights greatly reduced. (I don't mean the "housing" category in general)