And easily tested.
Is it true that the other costs of living have gone down in real terms. If it is, then we also need to know if people are buying those cheaper products and services.
We also need to know which groups of people are affected by which price-changes-over-time, in real terms.
This seems like information the statistics bureaus are likely to collect, definitely recall seeing this sort of data published by the Australian Bureau of Statistics, and I vaguely recall the costs of living have gone up but I’ve never attempted to dissect the data.
I think the most important idea from the parent comment here is whether it’s possible to live on rice, lentils, onions, and potatoes, plus heating and cooking energy, at a lower rate now than the recent past, and if so why are we choosing not to.