I don't have the foggiest idea what you're on about. The subject was bitcoin "cold storage", which is the idea of storing the private keys to a walled offline, out of the reach of network-enabled attackers.

You're just saying that recovering a private key is mathematically hard, but that's not the attack vector in question. You still need to store the private key somewhere, and that storage is subject to attack. Network-attached storage is subject to lots of attacks, thus there's interest in storing this stuff offline.