Re: A couple of degrees...
I checked the pic and had somewhat the same reaction. It's really not tilted much.
On the other hand, liquid doesn't need much to start going down hill, so that tilt was certainly sufficient to have the coolant pool on one side, which means the other side didn't get cooled. It also obviously indicates that Google is not using pumps for its coolant system (saving on electricity), otherwise the liquid would not have a choice.