They never set a specific release date. Fusee gelee was July 15th, atmosphere was just "when it's done" hoping for around the same time as FG but only guaranteed a release when it's done. The "by end of August" was also not a guarantee, and because 6.0.0 leaked data mining that became more important so it pushed back work on Atmosphere (but still in the end ended up being work for atmosphere 6.0.0 support).Watch them delay it again. I don't know if I'll be using it tbh because it seems like they can't hold any promises
I've said it before and I'll say it again, if all you care about is piracy then you already have what you want. If you care about homebrew then atmosphere has an exciting future ahead of it.