Yeah, that's good if you have a K10. I thought this new program would fix that but it seems that K8L is a very small subset of the K8 family. Too bad.
The later Turions are a rather strange mix between K8 and K10 and support HWPSTATE just like the K10, while the CPU core(s) still are K8. Current Turions are K10 all over, though.
Point is: overclocking/undervolting on the K10 from Linux isn't something new like the article states.