Earlier quoted context omitted.
There's a lot of fiddling done on the numbers. One thing they do to keep CPI low is using "equivalent items". So if the iPhone 4 cost $500 ten years ago, and you can now buy an "equivalent" cheap Android from WalMart for $50 then they measure this as deflation.
And that's fine right? 13 years ago an enthusiast-class graphics card went for $300[1]. Now it costs $650[2] (more if you include scalpers). Does that mean PC gaming hardware has inflated by 2x? [1] https://www.anandtech.com/show/2556 [2] https://en.wikipedia.org/wiki/Radeon_RX_6000_series
They will say your 13 year old HD 4750 costs next to nothing these days. They compare like specs now with those last year, so technological progress is counted as deflation.