The standard operating procedure is to reach out to the AD and/or the HC to get permission to speak with the assistant. Assistants don't want to interview behind the back of the HC because you never know when you'll be back on the market and need a job. With most schools getting into the conference portion of their schedule, the HC needs everyone focused on their role. As CNS says, all this external clutter just distracts from where they need to focus.
Don't be swayed by the media. Nobody has been contacted. All the lists you see are simply speculation. No interviews or hiring will be done until after the season.