I meant is there any offline wallet which was built by Satoshi Nakamoto. In addition to it where Satoshi has stored his bitcoins? In an offline wallet? If yes then which one?
Bitcoin core is one of the wallets they develop and honestly it is not fully developed by satoshi there are many developers who contribute to building the wallet.
If you want to use a wallet offline there are many options but if you want to stay using Bitcoin-qt well, there is a guide that you can follow how to make a simple offline wallet with Bitcoin core. You can follow it from the Bitcoin wiki below.
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https://en.bitcoin.it/wiki/How_to_set_up_a_secure_offline_savings_wallet