Either way, your logic isnt exactly right. Its easy to see that the E30 has much more noise, vibrant colors or not.
Notice the girl is bigger in the E30's samples but the squares are the same size. This means that the E3's image was in a more significant crop, which makes this all the more impressive.
What do you mean by a more significant crop?
I think the E3 lady image is smaller in size than the E30, b/c E3 has 10 megapixels v. the 12 in E-30. As far as the boxes are concerned, I am assuming that the testing was performed in the same manner as the lady image, and that the tester did not zoom in to give us an image of the same size as the E-30 (given that he didn't do that with the lady image).
I think the color totally has to do with the noise that we see. The colors of the E-3 are washed out, and almost white. It's harder to see the white speckles when it blends in with the photo. This opinion is of course based on a purely logical point of view, and has nothing to do with photography knowledge (which I barely have more than my 3 year old nephew). The lady image on the E-3 @ ISO1600 also seems softer.
I cannot read the language on that site. If you can, does it say anything about applying noise filter on the head to head comparison? I can see that in the sample JPEG images @3200, they have a comparison of JPEG with noise reduction at different settings.
One thing is for sure though, @ high ISO, the D300 looked better than either the E-3 or E-30.