Satoshi's address might be, as there are some markers that suggest this is the case. However, this is unconfirmed as we do not know all of Satoshi's wallets, and we do not know with certainty that he (or they) cannot access them. The Satoshi address which we do know of only contains a small amount, but they were mining BTC before modern exchanges such as Binance or Coinbase existed, so it may have been harder for them to cash count compared to current-day standards.