I personally think it is safe as an offline wallet offers the highest level of security for storing crypto is it involves storing the funds in a secured place that is not connected to any network. This type of wallet can also offer good protection against computer vulnerabilities. The hardware wallets are the best type of offline wallet that offers very high security and ease of use. Also, as these wallets allow backup, you can easily recover your funds if you lose this device.
One such example of a hardware wallet is Trezor. It operates as secure cold storage. You can easily transfer bitcoins to the device using the Trezor interface, which is accessible from macOS, Linux, Windows, and Android. Its interface is quite easy to use that lists your coins and recent transactions.
Trezor uses a 12 to 24-word seed for protection and recovery and a user-defined PIN. You can also add an encrypted passphrase to your wallet for an added layer of security.
what say u?
Cold wallet is one of the best asset protection methods available today. Just as many wallet mobile themselves claim to be "hard wallet without deveice" but many people have complained that they lost their properties via mobile wallet. So for me the hard wallet is still the best