the new title is actually incorrect, the "secret" RPG is not the released-to-the-public game but actually "[The] Starlight Lines employee forum" if one is going to be literal about it. I'd personally just keep the article's title.
(The reason for not using the original is that we don't want clickbait tropes like "The Secret Celebrity Foo That Bars Have Been Bazzing For A Bazillion Years". A good HN title is accurate and neutral.)