This whole situation couldn't stink anymore if they'd tried.
As widely predicted, the FIA waited until the Championship was confirmed before releasing this information. The Championship which was only confirmed this weekend after someone suddenly remembered that they'd thought of, but not written down, a new rule after Spa was called off, regarding how many points would be awarded in rain shortened races.
If Red Bull fess up to the FIA, they can agree a suitable "punishment" between themselves and that's the story put to bed. If Red Bull can't reach an agreeement with the FIA then the case goes before an independant panel of judges. Hmmmm, let me see. What do we think is going to happen?
There will be lots of farting noises from Horner over the next few weeks followed by an agreement between the FIA and Red Bull. We will not know what that agreement looks like (the FIA have a precedent for this. They did the same with Ferrari a while ago) and that will be that.