I don’t know exactly what they mean by “overall arc” but these basically have more backsweep than most which would usually reduce your effective reach, so they’ve also put some offset into the bar shape to compensate. So the backsweep moves your hands backwards, and the rest of the bar moves your hands back forward. Kind of like an old On One Fleegle only less dramatic.
Worked well, for me- I had the riding position I wanted but just wasn’t quite happy with the wrist position so this kept everything else pretty much the same. I’d have just swapped stems if it didn’t but it was nice to not bother (I’ve got a pretty good collection of “ew, that’s so last season, stems are 5mm shorter this year” stems so putting a little length back would have been no problem)