This is a lie, or miss-quoted.
PS3 install system for PSN content uses compressed "packages". Much like compressed archives but with extra info inside like switches for minimum firmware version, where they can be installed from etc (like a bluray or hard drive).
PS3 has to "install" all package content to be able to use it.
This is not going to be changed for one single game because it's what makes up the whole system, things would have to be changed on the firmware level to allow it and I call BS on any such change being made for a single game, or even multiple games this late on.
Who's up for a bet that the only way this will work is if the game is downloaded in 2 "chunks" like episodic content and only then would the 50% be playable....
Much like Ni-No-Kumi, that was divided into 2 chunks for a PSN release due to size, would be easy enough to keep the core binary/engine files in both chunks. This game didn't do that, but it easily could and the technology is about as old as the abacus. (keeping core files in first chunk)...
It's how games needing 2 CDs work!
So effectively this isn't news at all (no offense OP), and could be done on any game.
