I've seen him at Flag a few times. But it was several years ago.....
Speculating here.
I do not think DM is as paranoid as LRH was in the last 20 years of his life.
But from his other actions, he has at least a couple of escape locations ready, and probably some form of mobile command bases.
What is interesting is that he beats up on his people so often that the people who are in charge of his backup locations and/or mobile bases he would have to rarely see him to stay loyal.
Gold II?
Why not Platinum, or Rhodium?
Or is that what the Mexico landing pads are called?
Gold was a great place for LRH to hide because it was secret until the multiple factors made it not secret.
Then it just became a secluded resort for the elite staff and "some" public.
Now it sounds like a Money Pit.