I am surprised that Luke didn't use Multisig, that is must have for anyone that is dealing with larger amount of Bitcoin, like in his case with over 200.
like myself. i have hoards from earlier years. that have not been moved. so due to lack of multisig in early years it wouldnt have been put on multisig when first received. and (even i havnt) bothered to move coins from old stash
coins were not on a hardware wallet. as that also requires moving coins from old addresses
he said he had alot of old legacy keypairs, some on a hot wallet and some backed up in physical form stored in a physical house-safe
he said he doesnt have a hardware wallet or airgapped pc.