What do you think would happen to those UTXOs that don't move at all (lost coins/Satoshi’s coins/etc.)?
For coin without any owner (as in nobody has the private key), nothing will happen if the public key isn't revealed or doesn't use P2PK.
Totally agree with that. And Satoshi selling all his coins would be destructive as well.
But we assume it won’t happen (selling, not moving). But would it be the case for anybody else?
Would this selling pressure be recoverable?
Don't forget Satoshi can't sell his coin without attract attention or potentially de-anonymize himself, so it's very unlikely it'll happen. As for everyone else, we only can hope they continue holding or understand it's hard to determine whether someone actually plan to sell his coin only based on blockchain data.