I think you are confused. Well you confused me.
Tickets just released. Well it was sold out for two nights, but now there are extra tickets that have become available. Perhaps these were the fan club allocation that did not sell out. Perhaps they were corporate tie in tix that the sponsor cannot attend. Perhaps they only planned on selling 600 tickets so it would sell out quickly, making it look like a bUzZ show. It then as the date gets closer they magically find another 500 tickets, which will obviously be snapped up like the hot-cakes they are.
Why do you think "not releasing tickets means"?