For the Playground version, I presume discussions pertained to it are supposed to be adressed in the dev forum (where approrpiate, after all), since the people behind it and everything else pcsx2 are hanging there.
Playground still qualifies as 'work in heavy development', the same way the regular betas do, so I presume there was no chance concerning that policy, other than mention that advanced support directly from the devs/feedback/development-specific discussion are located on a more proper and easier to maintain location.
It could be nice to have it either confirmed or infirmed, so as for any possible ambiguity about the current status of the old policy about betas be lifted.