Is it possible to say that Bitcoin in every wallets for the past 2years without moving are considered lost due to death or lost recovery keys? It's pretty hard to believe that anyone won't come back for their Bitcoin after 2years with no activities on the wallet.
We cannot decide too soon that a bitcoin that has not been active for 2 years in a wallet is a bitcoin that is lost or whose holdings can no longer access the wallet, because sometimes many investors make long-term investments and after buying their first bitcoin then they don't want to touch it again until it arrives at a predetermined time such as leaving it in a bear market period to avoid panic bitcoin price movements that fall during that period and will surely return if the bull market comes later.
Yes, 2 years is too short a time, while the bull market we usually see will take at least 4 years to repeat. So we were too hasty to conclude that those bitcoins were lost just because of 2 years of inactivity.
In my opinion, there is no fixed period to determine that some bitcoin is lost just because it hasn't moved for years and there is no method to determine how many bitcoins have been lost. Unless we know the owner has lost their private key or, for some reason, they have lost access to their bitcoins.