Probably the guy who made the chart didn't update the Groove blurb at the bottom since there are still Power Grooves on the chart. There's no information available on the black/purple solid either, and it doesn't make sense that it would have the same specs as the pearls when the surface and coverstock are different.
I have a black PG, it was my first reactive ball. Maybe it's that I've gotten significantly better from when I first got it but that ball was kind of a turd for me.
SH