Quote the whole post for context. We are using an air-gapped computer in that example. I personally have both physical, and digital back ups of my keys for my cold storage. I feel more secure with my digital back ups because I have them encrypted.
I don' understand. Could you explain why the existence of encrypted digital keys should make you feel more secure and comfortable especially considering the fact that they are practically useless without the secret key that is required to decrypt them? The problem with the decryption key is that you can't make it encrypted because it is pointless from a security perspective, you also don't want it on digital media because that only increases an attack surface. In short, having created more digital copies of your keys, you also must keep more physical copies of your keys to access your digital ones. The more backups you create, the more likely you will lose access to one of them, which may result in losses.