Article seems to be written by a nocoiner friend of a shitcoiner. Rolling your own security like this is a great way to lose your stash. Maybe you don't care if you own dogecoin.

Novel idea but if you’re going to do this you might as well use pen and paper.

how can I zap that dude

There's a name for this: steganography

For a regular joe the biggest risk is probably just losing your media where the hidden data is stored, for reasons entirely unrelated to a threat actor

Ah, but, what if the robber was 'a friend of Dorothy'?

Best choose a Billy Graham VHS.