I'm going with fake, but a plausible story.
This story suggests that there was no/infinitesimal amounts of drugs sold, gang activities, killing and getting locked up until 91' onwards in the black community or otherwise. The music is not a contribution to the situation, it's a reflection of it. What sober just done was actually my next move, look up some the first gangster rap releases, or even just any releases before this supposed date.
There are some elements that have some truths, more or less, in terms of corrupt gains and some legal loopholes thus the plausibility of this story. Still, I think anyone who believes this to be true without any more info, evidence or corroboration are those who want to believe in the "Big corporations are conspiring to get me, my family and our neighbors; the little people" stories because it seems like it's the easy answer.
It's no different that the whole, the Illuminati controls the music and movies and magazines and TV and the internet and your MP3 player and the phones and the billboards and your board games and your playing cards and your pen and your jewelry and whatever else you have little to no control over crap people keep spewing every single day when they know nothing about The Illuminati or any other occult for that matter.
Maybe we need to bring true horror into the movies and games again and not just suspense, cause people seem to just want to scare themselves with ideas of shit they can't control or crusade against.