Only capital-S Ships (which doesn't include subs) in an adjacent sector prevent the objective from being taken. (Though subs can prevent you from taking it in the sense that they can sink the other side's ships.)
Or, what I am trying to say is: If that anti-air phase is over, which I think it is, I would like to use the Kondor’s anti-ship missile to attack the Hoel.
Yep - AA phase is over, you're out of range for me, so we're on to Air Mission. Roll nine dice attack on Hoel at your leisure (and I see you're on mobile, so just click "Desktop" at the bottom right so that the dice don't display gibberish)