1. Bitcoin is FIAT-bounded, and through exchange rates, has a worse inflation rate as FIAT.
I may not understand properly what you mean here, but isn't it the other way around?
Even if your 30-40% "inflation adjustment" is true (I believe it is closer to 25% since 2013, because there were long stretches of very low inflation rate, only in the last 2 years it accelerated), you get an inflation (=deflation) rate of
-96% for the last 10 years (taking for 2013: a price of $500, and for 2023, a price of $15000), which (estimated without calculating it) is about
-15% per year.
If you have a good valued $100000, then in 2013 its price in BTC was
BTC200, in 2023 its
BTC6,70.
At this moment, Bitcoin is deflationary. This may change, but we're still not there.
What is about the "chain-inflation"? First Bitcoin has 21 million, first fork has 21 million, and so on - and all this Bitcoin eating from the same bowl...
Yeah, but the main chain Bitcoin is still $15000 (in 2013 prices) or $25000 (in 2023 prices) worth, because you must add the market cap/price of the fork chains, not subtract it. The fork coins aren't fungible with the mainchain BTC. Or would you pay $10000 or more for a BSV?
If I'm completely misunderstanding, please elaborate

(sorta interesting topic, by the way).