I'm just not getting what he means with that, whatever signing device you use to create a multisig wallet always contains all public keys from other signers, so if one of them is compromised, you can still recreate that with any of the signing devices or their backups.

I wrote about my own setup and I think it should be more widely used, it's actually not THAT hard.

Didn't want to mention before, but I feel there is a conflict of interest from people publishing many things on multisig, they always mention some kind of fancy HWW (ahem sponsor).