Mine is implying a ModuleScript which can be updated at any time, or one that doesn’t even need to be updated in another post, can run malicious code whenever it wants and there’s no way to make sure it’s safe to use. Your example implies someone who had access to edit the game directly put code in that exposed people to inappropriate content. These are very different things, regardless of the similar outcome.
Regardless of whether it’s a front page game, even one child exposed to mature content is undesirable. Mine is not an edge case, it’s a possibility. Yours is considered an edge case because it’s extremely unlikely and caused directly by actions of a developer for the game. If anything, the person who hired that malicious developer and gave them full edit access to the production version of the game is at fault. They were perfectly able to ask someone else to verify the source.