1. I live in a village. I buy flour on credit from the miller, because I lack funds and they know I'll be able to pay them back after I sell my own textile goods at market.
2. I travel overseas to a store I've never seen before and I will never see again. I transact $100 on my credit-card purely because my debit card won't work for some reason. I leave with the goods, reminding myself to pay off the balance ASAP with funds I already possess when I get back to the hotel and a laptop.
Technically they both involve "credit", but it's not really equivalent. The first case involves a direct relationship in a community, while the second is indirect, a stranger trusting my card-company. In the first, incurring a debt is an intended feature, in the second the temporary debt is just a weird inconvenient quirk that I'd rather skip entirely because it makes more work for me.
In short, just because someone uses a credit card doesn't necessarily mean it's "credit" in the anthropological sense.