It very specifically mentions "rubbered in areas" when wet. We all know the groove effect increases grip, and continues (continued!) to do so when wet. Sounds like this has now been adjusted, presumably either to remove that grip increase or perhaps reverse it to some extent.
I honestly don't know why you would even think about the surface roughness thing from this. Hey, would be great if that were cleaned up / fixed / explained, but if you read what it says there seems to be no reason to presume anything along those lines.