1) I am very dubious about the results and how a single core can beat up two cores' cpu. Was the software used for benchmarking designed to take advantage of PA6T's both cores?
2) The fastest OS4.x was Pegasos II. A1X1k should be faster than a G4 ~1.1Ghz (I believe). Still, benchmarking in Debian is pointless since no one is gonna buy a similar unit to run solely linux on it, as a primary targeted OS (develop, used for simple task everyday tasks etc).
3) I think that PA6T was already on the market (meaning, shipped to various developers) by 2007. That's already 5 years ago. So no one could characterize it as "modern" by any means.