Well, I just read through that review, and it hasn't changed my attitude toward resolution claims regarding flatbed scanners. They're all hugely bloated. Years ago, I tracked down a set of tests where the Epson V7xx series were evaluated against some other good scanners, but also in absolute terms. The V7xx scanners were managing about 2300 ppi. My Epson 4990 came in at about 2000 ppi. They used the AF test chart for determining resolutions. But one thing I noticed about my Epson was that, even though it may have maxed out at around 2000 ppi, I noticed greater color resolution than sharpness resolution -- that is, there was indeed more color resolution being displayed at the bloated scanning depths the scanner permitted, even though the sharpness resolution had peaked at lower outputs.
These days, I still use my 4990 but only for scanning medium format (I don't own any large format cameras) at 2400 ppi to minimize file bloat. I use my 24.3mp digital to dupe my 35mm images, although most recently I've even begun to dupe my medium format images with my digital.
I bought my 4990 after talking with a couple of guys who use it to make scans of their 4x5 images. After inspecting some of their output -- printed on quality archival paper -- I saw why they liked the 4990 so much. So I suspect the 4990 and later models would do an outstanding job with 8x10 images as well.