I'm not sure if they would actually ALLOW the original taste, because the actual original Coca Cola had cocaine in it. A small amount, of course, but drink too much and you'll get high.
It eventually got banned, because people were getting high from it, but probably a long time later they released Coca Cola again, this time with 0% cocaine, so it was allowed once again.
Now, back to the 'original taste'
It's not the old Coca Cola flavour, it's the normal, modern day Coca Cola. The reason it's 'original' is because it was before the Diet Coke, which is the decreased sugar version of the original.
So there! I explained it!