Shogun Showdown page on Grouvee but not Giant Bomb?

Grouvee, which pulls from the Giant Bomb database, has a very sparse page for Shogun Showdown:

https://www.grouvee.com/games/101346-shogun-showdown/

I came back here to Giant Bomb to fill out its wiki page a little more, but I can't seem to find a page here on Giant Bomb when I search. Does anyone know why a page would exist on Grouvee but not Giant Bomb? Is there anything I'm missing here? I can create a page for it on Giant Bomb, but this seems like an odd situation to me, so I wanted to check first.

If a game doesn't have a page on Giant Bomb, Grouvee pulls that data from somewhere else. I'm not sure where they get it from. Or if maybe they have a system where they can create their own page. I've been in this situation a couple of times, and I always just create a page here when it happens for a more detailed entry.

EDIT: I'm guessing they're pulling that info from Steam. I went to go look at a couple of games on Grouvee that I know didn't have pages from this site, and their descriptions are taking word for word from Steam pages. I'm pretty sure Grouvee has some sort of Steam integration for user accounts too, so it might be hooked into that.

@brian_: Thanks for the clarification! I didn't know Grouvee could pull from anywhere else, but that explains things. I'll make a page of Giant Bomb for Shogun Showdown then.