I generally assume he was moving on to battle an illness, and that he lost the battle and died.
LOL how you assume that he died.
To make it clear, he said that himself, suppose to be the case without any proof in short assume

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We need to look the value and make the money with that if Satoshi comes to live we may expect good price growth considering this as positive move for crypto field. We wish to have the official announcement of Satoshi soon among us.
If Satoshi could prove himself at a later stage he would have been back when there was a big battle going on regarding scaling and if he ignored that it is evident that he is not interested to assume that character once again.