This is the only statement they can make that is reliable. If they were to tell you any timeframe then that would only be guesswork. When they said “September” that was a guess - not a promise - and it wasn’t far fetched as guessing how long you’ll need to port an OS may not be too difficult. They were actually done in June and obviously didn’t expect that beta testing would take longer than July.
Then they encountered severe issues with bluetooth and battery and are trying to fix them. But guessing how long you’ll take to fix bugs is obviously not that easy.
So once again: You can either hear what you want (an exact schedule) or something reliable. Both is simply not possible.