However, if Satoshi himself were to publicly make changes to Bitcoin or destroy Bitcoin, then that would be a different matter. However, if he remained behind the scenes or indirectly hidden, then Bitcoin would definitely survive for ages.
How would Satoshi change or destroy bitcoin?
You need to know that even though he created bitcoin, he gave control of bitcoin to the community. That means that no one can arbitrarily change the bitcoin protocol, including its creator, and any changes must have consensus from the community.
Bitcoin cannot be called decentralized if someone or even satoshi can easily change or destroy bitcoins. Therefore, the existence or appearance of satoshi will not change anything or affect the existence of bitcoin.