The core idea
CPI can move bond yields because inflation affects the expected path of central-bank policy and the real value of nominal fixed payments.
What is happening underneath
An upside inflation surprise can raise expected policy rates and inflation compensation, while a downside surprise can do the opposite.
How investors should read it
Real yields and breakevens help identify which component drove the move.
The same market move can carry different information depending on which maturity, issuer and risk premium is changing. Read the question together with the underlying concepts rather than treating one price move as a universal signal.