I believe somebody merged 2 concepts, and that is causing the spread of this misinformation.
1. You can (now, must) merge your WoW account into a battle.net account. You can do this when you know your WoW username, password, and (if you use one) authenticator code.
2. You can store your Warcraft 1/2/3 & Diablo 1/2 & StarCraft CD keys on your battle.net account. This will allow you to play without having the physical CD on hand, download a new copy of the client, etc. if you are connected to the account. (I haven't tried this to see how well this works - I may have heard you still need the physical CD to actually play.)
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