The article makes a profoundly useful observation about the nature of inflation. To an economist, inflation is an increase in the supply of money in relation to the supply of goods. Non-economists routinely get this wrong by assuming that inflation consists of higher prices.
The difference is important, because higher prices can occur for any number of reasons that have nothing to do with the supply of money (e.g., bad weather). It is also important for the reason the author states: All else being equal, prices logically should decline over time as better technology and process improvements accumulate.
A further subtlety — possibly the most important one — is that government policies which aim to control prices actually have nothing to do with real inflation, but can fool a credulous public that doesn’t understand the jargon. As the article points out, the Federal Reserve uses the consumer price index as a factor in deciding whether to increase or decrease the money supply. But because there is a time lag between the occurrence of a new money supply level and any new price or CPI effects that may result, the Fed can create inflation while pretending not to.
Right now, for example, the CPI is at 6.2%, the highest in more than 30 years. At the same time, the Biden administration wants to create trillions of dollars in new spending. If successful, the result will be to add monetary inflation to price inflation — a risky proposition to say the least, since monetary inflation tends to become price inflation.