It also does not help you to update the address later.

It does if it leads to a web page with an address.

What happens when all project maintainers die and the source code disappears?

It does, but I think the person you were responding to was referring to the "This should not require any Internet access to view" part.

Hopefully it will never disappear, since Software Heritage and ArchiveTeam will have saved it.

https://www.softwareheritage.org/ https://wiki.archiveteam.org/index.php/Codearchiver

Hope is not a strategy. As much as I hate crypto, something on the blockchain might be more durable. You want something that isn't reliant on any one person or company to continue to exist (though maybe the long now foundation will) and even if Bitcoin goes to zero, I think there will be some die hard true believers to keep running miners even past the built in 2140 expiration date.

you also have die hard true beliviers data hoarder/archivist