Tautologically false, has to be one of the oddest things I've ever seen to be so wrong about. Like, you're using big words to indicate that under no situation

Tautologically false, has to be one of the oddest things I've ever seen to be so wrong about. Like, you're using big words to indicate that under no situation is this true, when the reality is that "inflation" is not by definition CPI. CPI is one measure of inflation. But it just caught my eye that this seems, extra wrong. It's hard to read something extra wrong on the internet, and yet it feels like you've succeeded. People are wrong on all of the time, but to call something tautologically false when it's trivially true, is peak wrongness.