That is the intended use for this as well. The markdown is just for a template that is easily extensible.

I think this was more to inspire a rough contents and format, rather than actually proposing GitHub is a good place to store this stuff - print it out and stick it in a safe.

This is the way :

keepass database with passwords and secrets, paswword protected archive of 2FA qr codes, on usb drives, in two locations.

Master key and phone pin in the safe at the bank

The important thing is that it be easily accessible...printed for example. No, you don't want all your passwords on a piece of paper. But pointers to where the passwords are, how someone can get emergency access to them, as well as locations of other accounts, documents, etc. is what's important.

One of the main value propositions of Markdown is that it's readable as plain text.