That doesn't hold with games, and that's exactly what this law is addressing. Many (if not most by now, I haven't bought many games recently) physical games are now just an unplayable kernel and you have to download the actual game. If you sell the physical good you are selling a piece of plastic. Quite a few don't even contain a cart or disc in the box, it's just a download code.
Now, yes, you can say "but first sale still holds, you aren't prohibited from selling the object you bought", but most rational people are going to call that nonsense.
Now, yes, you can say "but first sale still holds, you aren't prohibited from selling the object you bought", but most rational people are going to call that nonsense.