The game is "confirmed," but, according to Polar, it was internally delayed. This is a very specific detail, which is why I'm confused the 5chan got it right but might have gotten Jack Frost wrong
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15 minutes is not an accurate portrayal of what's in the game and what we don't know.
It's on the verge of being unreliable, I agree. But like the Gematsu leak, there could be some truth in there. It's not a black or white scenario like we're trying to make it out to be until we actually have something. Again this is why I'm saying wait until Joker is released. Maybe the trailer didn't show off Jack Frost anywhere because it was a minor detail.