It seems to me that debit does that more than credit. I don't actually have to touch fiat to use credit.
Say I have my fiat check deposited with Strike and instantly converted to Bitcoin. I use a CC for my fiat bills. I then pay the credit card from my Strike Bitcoin balance, which gets converted to fiat when it goes to the CC company.
Fiat debit requires me to hold fiat for a time.
You can argue that both contribute to fiat card fees and transactions in fiat, but less so than me storing my wealth (even in part) as fiat on top of that.