Inflation typically refers to the decrease in purchasing power of a currency over time due to an increase in the supply. When more money is printed or gold is mined, the value of each unit of currency decreases, leading to higher prices for goods and services.
Since the supply of Bitcoin is fixed and cannot be increased, it does not suffer from inflation in the same way golds does. The inability to create more Bitcoin ensures that it remains scarce.
What you are calling inflation is simply the issuance of an absolutely scarce commodity. It doesn't matter that it hasn't been issued yet, all that matters is that no more than 21 million can be created.