How is it misleading?

He or she is talking about buying a Core2 Quad as an upgrade.

That means he or she has a motherboard with a LGA 775 socket on it. A lot of those motherboards, not all but some (particularly old ones, and if he or she has had it for years already running e.g. a Core2 Duo it will be old), take only DDR2, and the fastest DDR2 you can get is 800MHz. If he or she already has a very fast new graphics card, and a Core2 Quad, DDR2 on the motherboard will be a potentially serious bottleneck.

Spending money on a computer is a balancing act, if you buy two fast items and leave a third slow, it will be the slow one that is the bottleneck. Better to spend a little less on the first two, and upgrade the third as well. Knowing what is relatively slow is difficult, but in this case, in my opinion, DDR2 is a very serious potential brake on the system.

You are totally right. Just directly talk about memory and that it is the bottleneck at first was a little misleading, because not knowing all specs. But it is okay as you told him now. There was nothing wrong. So, everything is clear now.

One last thing: I do not know prices, but I can imagine, that you get an i7 or i5 for nearly the same money. Just a mainboard and new memory should be affordable... :)

My specs are in my signature, runs the game decently all though with quite a bit of stutter and the occasional 1-2 second freeze (Due to the slow DDR2 ram).

CPU usage analysis confirms that the CPU and RAM are the flaws in the system, the 6870 runs surprisingly well!

I run locked at 40fps by Bandicam, fps usually varies from 25-40 depending on where I fly. Some issues with textures.