CPI simply does not measure what people think it does when it comes to inflation. Did costs for homeowners actually increase 19% in 1979? After a 12.4% increase in 1978?
Of course not. Yet this was part of the CPI numbers. It's even worse now with Owners Equivalent Rent (OER) too.
Sadly, there is no right answer when it comes to measuring inflation. "Just measure a basket of goods, Josh! That's all you need to do!"
Ugh, if Ribeye goes up say 50% and chicken remains the same, what will I consume more of? Chicken, indeed. So, how does inflation account for the change in consumption? See how dicey this is? It's not an easily solvable problem.
Ed McQuarrie talks the REAL History of Stocks and Bond performance.
https://www.morningstar.com/funds/vanguard-wellesley-income-is-top-choice
Could be a great fund to start with starting in retirement and cash. Or use Vanguard Wellington and cash if you want to be more aggresive