While I am not sure who is writing that advertisement for gamestop, the SE store gives a different description. There it purely states "A new residential district: Shirogane" among its features. https://store.eu.square-enix.com/eu/product/425194/final-fantasy-xiv-stormblood-pc

If we then look at patch 4.1 when it actually gets released I believe SE always used the words, "players will be able...", because there is a limited supply doesn't mean players aren't able to obtain a house, if you didn't receive one now then you will be able to receive one later.
Now that the demolition timer will be activated again, you will find it much more frequent that players will be evicted from their houses due to their long breaks or as before, server transfers. Be patient, check the aetherstone in your capital for available houses frequently and then just snatch it up.

Secondly, there may be plenty of accounts per server, but how many are actually active players, this is why when the game developers asked the player base which housing model they preferred, we ended up with the current one, because it allows the active player to have a cosmetic edge over the ones who take a break, imagen 9999 wards, where there are at best 2-3 active players in every ward. Sounds not so enjoyable to me, now at least I have the opportunity to interact with my neighbors when I idle at my estate, and yes, we do interact.