The game could easily rely on functionality that is no longer available. It may now violate some new content guideline. Either would have the effect of silencing them.
The author will eventually die, and then their work will either be modified without their oversight or deleted from the archives.
As the quote says, the problem extends beyond just video games.
What no longer available functionality, specifically, should be in the store? That story does not make sense
What things against content guidelines should still be in store? That story does not make sense
Oh no, a store doesn't carry a video game for all eternity, past an author's death? Oh no. Since Apple is the country's archivist, the phone store should probably carry every single app ever written for all time. Screw the user experience, Apple's obligation is to the author of Lizard Pong
The author will eventually die, and then their work will either be modified without their oversight or deleted from the archives.
As the quote says, the problem extends beyond just video games.