This is too confusing. :p
There are too many different definitions of "TS", "TG", "CD", "woman" in this forum to have any agreement on anything.
The point is though, there are those who think they are women, and there are those who are. This is to be expected in a community as varied as this one. With time and practice, you'll develop a sense of this too and you'll see it in the various posts here and there. It is rather nebulous though and I don't think that anyone can be as precise about it as you would like.
As to how you might greet them? In general terms like the rest of us and try to not be insulting. Even though you will have doubts about some people and only time will prove to what degree they will have followed through their claim that they are women, no one ever really knows for sure.
... except when you see people who are heavily involved in this forum, swear up and down they are women, and then they stop coming. They disappear into thin air, without having shared anything about any steps toward transition. This happens a lot here. The natural conclusion is that they've had second thoughts and it is easier to not come back than admit it.
