This argument is completely incoherent. You can't study the
cause of inflation by looking at the
distributional effects of inflation.
For example, in 2020 there was a huge increase in demand for used cars, and the price of used cars increased by ~40% within a few months. But people who sold used cars did not have their costs increase - they were, after all, selling an already completed product. The IMF would therefore estimate that between 2019 and 2020, ~100% of inflation in used car prices was due to margin increases rather than inflation itself.
This is obviously silly - the increase in prices was because there were too many buyers and too few cars, not because the owners of used cars suddenly because significantly more greedy overnight. It's the same with corporate profits. Inflation has distributional effects which are interesting to study, but we shouldn't confuse ourselves by claiming that the effects are actually the causes.