Harris did not (or may not have) but Democratic punditry and commentariats were full of "the economy is objectively great, why is it subjectively sucking?" articles, for months.
Because they look at metrics like GDP and the stock market and unemployment, and fail to realize that it's not evenly distributed. Increasing GDP and stock market indicate somebody is making a lot of money, but the average voter isn't seeing any of that in their own lives.
Well, they look at average wages, average hourly wages, median household income, median disposable income. All of these things improved right alongside "inflation" to the point where anyone who was not an outlier for those statistics ended up no financially worse off (and arguably somewhat ahead) than where they were pre-COVID.
The problem is that people remember the "old" prices, not the "old" paychecks.
It has been said that people see wage increases as something they have a right too (periodically, anyway) but see inflation as something imposed by a 3rd party with bad intent.