Games are such a hit and miss market, that it will probably be difficult to find an investor willing to drop a full 30 million into your studio, unless you (or your employees) already have a track record in the industry making games close to that budget.
Hell, I worked as a producer for a small video game publisher, and we didn't spend more than $1 million on any given game, that included development, certification, ESRB rating, and marketing (was 11 years ago now), although granted they were smaller games for Wiiware and Xbox Live Arcade.
And we only hired established development teams to make those games.
We did evaluate pitches submitted to us by other development teams, and it was usually a Powerpoint presentation describing the game idea and the team that would be making it and what experience they had making other games. Sometimes it included a playable demo and we'd play that first.
I remember we ended up passing on a couple of pitches that ended up getting released through other publishers, including BloodBowl for Xbox and Desktop Tower Defense for the Nintendo DS.
We also at one point considered making a game based on the anime Tekkonkinkreet, but that didn't end up going anywhere. I didn't know about that awesome movie beforehand, though, and it was cool to find out that a band I already really liked, Plaid, did an amazing soundtrack for it too. We watched the Japanese version in the office, so my boss was roughly translating it to me as we watched it, since I only knew very basic conversational Japanese.
I'm developing a video game in my spare time right now, and I'm just keeping the scope small enough it won't need a big investment. It won't need any at all unless I want to make it pretty with a proper artist.
Also, could you link to that post you saw? I'm not finding it myself so I can check it out.