Secret launches are not really possible in the sense that you mean. There are 'secret' launches for the DoD but those usually get announced just a very short t

Secret launches are not really possible in the sense that you mean. There are 'secret' launches for the DoD but those usually get announced just a very short time before launch. So it might be a week or so before SpaceX will be like 'next week we are gone launch NRO-balbal and then not provide footage of the second stage'. However, this was not such a case.