Inflation is not caused by economic growth, at least not directly. Growth leading to inflation is a false premise.
What causes inflation is an excess of money circulating in the general economy. Look at wealth and income inequality charts over the last 5, 10, 20 years. The growth in money spent is all going to a few super wealthy people at the very top who are hoarding it in their static wealth. It is not liquid money out circulating in retail and manufacturing, raising demand for products among the many. So price aren't rising.
Another factor is that many, many prices are by necessity tied to the price to produce refined petroleum products. The usable reserves have grown. There are more competitors drilling and extracting than before. The cost to process previously difficult to extract sand and tar oils (dig it up then break it down) have largely been supplanted by fracking. The major wars in oil-rich areas have settled somewhat. More homes and vehicles are being powered by other means. So those diesel surcharges from a few years ago that were part of every shipment of food, raw materials, or manufactured products no longer applies.The base cost of acquiring things has dropped, not risen.
A third factor is the scale of automation in the current economy. You're not calling to book a flight, then calling another number to book a hotel, and a third to book a car. You're doing it from a browser via an automated website that runs on automatically provisioned and automatically monitored web applications. You're sending emails, chats, or doing conference calls instead of tying ten cent per minute phone lines together in a hardware PBX. You're buying many of your physical goods from an app (phone app or web app) instead of a salesperson and cashier, and there's no showroom. Products have come down some in certain segments, but meanwhile much of the savings is more profit for the very rich mentioned before. Even basic consulting and product reviews are often crowdsourced. It's a service economy with the services automated. Those of us who still have work pay less than we might otherwise, at least until our jobs are also automated away.