I get where you're coming from but mining rewards aren't inflation. As you know, Bitcoin has a fixed supply of 21 million. This factor is already priced into the value of BTC. It is a fixed supply asset, and if the supply can never increase beyond 21 million, it can never inflate.
Discussion
that's the build in inflation, it gets less every 4 years. after the last Bitcoin has been mined the inflation stops.
How would you call it if not inflation?
Inflation means a decrease in spending power. This doesn't happen as a result of new Bitcoin being mined.
New Bitcoin enters circulation, less and less each halving as you said, but the total amount of 21 million is priced into the value of BTC.
The fixed supply is why it isn't inflationary.