Capn Bloggs,
You're right - it's been doing my head in too! Plane Finder has a B350 (DNG020) currently overhead the PH area at FL250 and it appears to be mirroring what is on Plane Finder.
It's not a PC12 based on engine sound although as has been said VH-WPE is currently overhead at FL200.
Cheers.
VH-MLE