That's a stupid argument; just because things get more expensive due to inflation does not mean that you should disregard cost increases due to other reasons, like currency devaluation.
If your currency is worth 10% less then that means that your imports are 10% more expensive. As a consumer you might only see a 5% increase in what you pay, but that just means that the importer is eating the other 5%. That extra cost means higher operating expenses/lower margins, hence lower profits, lower tax payments (or at some point the company goes bust and lays off all its employees, with all the associated costs for society). Etc.
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