That thread that's linked has conflicting info... the first guy says...
"Assuming that you're using OS9, the plugins should work. I exchanged my 001 for the 002 and use all my old plugins."
"I installed the PTLE software that came with my 002, and PTLE found the plugins without any problems"
THAT'S encouraging, but the second dude says that they're incompatible because...
"DAE is a DLL with PT version 5.3 and later."
We know that (according to Digi) 5.3.2 ONLY works on the 002 with the mixing console and NOT the rack version SOOO... my guess is that most people miss that little tid bit of info and lump all 002's together, claiming that the plugs won't work for their 002 (rack)!
I'm HOPING that there's confusion due to most people having 'mix and match' OS9-OSX... PT 5-6 and trying to install mismatched stuff and not being aware of the 002(R) exclusion!!

It certainly WOULD suck if indeed the OS9 plugs won't work with 002(mixer) but I agree that it doesn't make whole lotta sense if that's the case. I guess we'll find out!!