This reminds me of the items that they distributed via the internet in New Leaf, like the shaved-ice lamp. Some items were unable to be obtained at all unless you logged onto the internet in-game between certain dates. If you didn't happen to play during that time, you had to either do without the items or trade with someone who had them. Even the Gamecube version of Animal Crossing had items that could only be obtained using special codes you told to Tom Nook, and even then, sometimes the codes were never given out, even though the items were programmed into the game. Animal Crossing has always been like this. Doesn't make it good or bad, but it does make it unsurprising that it's happening again.