The reason for this is that the supplied items for testing are actually ones the companies send to the magazine. Usually on a test and return type deal. AKA the company sends it out to the magazine while they review it, then they collect it back afterwards. So if Kodak don't want to be reviewed they don't send test models out.
Most magazines could not afford to test cameras or any hardware out if they had to purchase each and every item themselves. Plus there is the entire thing of what to do with it afterwards.
You will notice this trend in all the PCA top 10 and review pages. The same as any other magazine. Even magazines dedicated to DSLR cameras only have their own small collection of in house cameras for taking magazine pictures the rest are usually tested and returned to the manufacturer.