How does Vitalik make secure transfers?

In 2021, when Ethereum co-founder Vitalik Buterin donated SHIB tokens to the India COVID-Crypto Relief Fund, the secure transfer process he adopted attracted industry attention. He designed strict measures: the private key used for the donation was held separately by himself and his family members, requiring joint operation to unlock; transaction information was generated on a specially prepared new offline device, and after multiple verifications, blockchain confirmation was, avoiding network risks that might be caused by online operations throughout the process. Due to the completed complexity of the process, it was likened to bank heists and plots from the James Bond film series in interviews. — link