You can always privately message the person posting and ask that way if you feel it would be of benefit. I understand why many don't feel it necessary, applicable, or even safe to post a general location.
Edited to add: AA is only one way to go about things, there are other ways to offer support to someone in need. Perhaps treat everyone as if they have no access to meetings initially and find out about them as you go, based on what they tell you, etc.