If we want crypto currency to be a currency we have to keep spending right? But at the same time it's something worth keeping too since I do the same with my fiat in bank for more than 2years without touching it. 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.
There is no way to be sure that any coins have been lost, someone could claim the coins at a particular address are lost, but unless they can prove that at some point in time they owned those coins and they lost access to their private key we cannot say those coins are lost.
And even in that scenario we cannot be completely sure about it as they could always find the private key and recover them or they were just lying about it and they can still move them, so even if some coins have not moved for a long time that does not mean anything, as there are coins which have not moved for way longer than 2 years and we know they are not lost as their owners signed a message and demonstrated they still hold control of them.