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CPI is designed to make the government look good, hence the article.The CPI is run by the Bureau of Labor Statistics:
> The "food price index" evolved into what we now call the Consumer Price Index (CPI). During World War I, rapid increases in prices, particularly in shipbuilding centers, made a more comprehensive index essential for calculating cost-of-living adjustments in wages. Studies of family expenditures were conducted in 92 industrial centers in 1917–19 in order to provide appropriate weighting patterns for the index. Periodic collection of prices was started and, in 1919, the Bureau of Labor Statistics (BLS) began publication of separate consumer price indexes for 32 cities. Regular publication of a national index, the U.S. city average, began in 1921, and indexes were estimated back to 1913.
* https://www.bls.gov/opub/hom/cpi/history.htm
It is one of most examined numbers in statistics, and while the "best" way† to do things is debated, are there any non-tin-foil hat people that think that the numbers are actually wrong given the published methodologies? Entire research projects (which have released source code) have examined the official numbers and found that they track things fairly well:
* https://en.wikipedia.org/wiki/MIT_Billion_Prices_project
† Often no such thing exists, but rather trade-offs in various metrics.