I had read(Now I can't find it) that the stripers were reproducing in the hooch...quite well. And they had went back to stocking hybrids instead.
They are reproducing to an extent but that is not the root cause for hybrids being stocked again. That was brought on by concerned anglers who wanted hybrids back in the lake. My understanding is about 25% of the stocking last year was hybrids and this year they may raise it higher.