No, the exact opposite in fact.
It appears CBS’ argument was that the policy was effectively changed after the event (by a more rigorous enforcement of the existing rules) and then retroactively applied to the network.
The ruling seems to be that the FCC couldn’t change its enforcement standards like this after the fact to apply to something that already happened. But the FCC is able to change its enforcement standards to future events.
So Janet Jackson’s nipple escaped. The FCC can announce it now has a zero-tolerance policy on nipple slips. But it can’t apply it against Jackson. However it can apply it against any nipple slips that happen after their announcement. Chief Justice Roberts essentially said that the new standard is now known and nobody can expect to be protected like CBS was.
But honestly my point wasn’t discussing the legal issues involved. I was just making fun of the fact that the American legal system spend eight years on something this silly.