That's true, but IIRC Stop Killing Games goes a bit further and aims for things like the release of server code when the servers get shut down.
- a) patch to game the game playable in single-player mode locally
- b) binaries to self-host a server
would satisfy that requirement.
Note that the details of implementations of any law that would advance the cause are still to be discussed, which is the whole point of the petition.
More on what would be expected and some example use-cases are available in the FAQ of the Stop Killing Games official web-page: https://www.stopkillinggames.com/faq