Your standard office worker probably refinanced their mortgage at ~3% and is now laughing their way to the bank as their debt inflates away so they probably are profiting from it. I know I am.

Your standard retiree on the other hand who holds a lot of bonds that got absolutely hammered by inflation and rising interest rates is not doing so well.

That 3% rate was plowed into a property whose price was inflated by exactly the amount that the 3% rate discounted the cost of money.

That only works if you’re income rises faster than inflation, otherwise the relative amount of debt either remains the same or even increases.

Investment income absolutely has

The only party "profiting" from inflation is the government which controls the money supply. If you keep the money supply constant, no one profits from inflation; inflation merely reflects supply and demand of the constant money supply vs all other goods and services on the market. Inflation does not reflect capital that is accumulated and taken off the market.