Hey kitsune, you can actually clearly see how he drew the top abs in the DBZ style. Example: http://dennis-toys.blogspot.com/2008/09/legendary-super-saiyan-broly.html this is of Broly, and you can see that they enlarged its width, probably to emphasize how large his muscles are in a stylistic way. (they did very minimal shading, remember, so they had to represent his larger muscles in a way that would be immediately understood without showing depth)
I will say that it makes no sense to have those two defining lines on the top abs, though, there is nothing muscular that could be represented by that. Just place a single line in the center, line it up with the rest of the ab lines.
About him having 10 abs, though, I agree it should be 8 regardless of style. There is no justifiable reason to add two more, so the bottom two abs in your picture tention should be merged, and thats really all you need to do to fix that. Remember, the bottom abs are longer than the rest.
ps. I dont know about you, but i am favoriting that page because thats an awesome way to simplify the chest and abs. The arms look a tad weird though, could use some repositioning. The back needs some shape readjustments as well I think.