Red flag three: The fact that there is a training facility at all. Any sub that serves you should be trained in how YOU want her to serve.
All of your points are valid, however the last one I thought I would share something with you. There are places who will train women and men for that matter in the ways of Dominance and Submission. It is really a BDSM thing. Most women who I have found to visit such places are those for whatever reason, are not interested in a relationship and enjoy going, learning and then going back to their life. There was one in New York City that operated for quite some time. I actually had a slave who came from there and they had a pretty impressive web site. I want to say they called themselves "Chess" or "Chessmen" or something along those lines, and each of their training regimens where based on a piece of the Chessboard.
If you are a ritualistic person, you probably would appreciate their layout. I don't believe they are still in existence though since I just tried to do a Search and I can't seem to find them.
I guess the point that I am trying to make is that there are such places and they do serve a purpose for those that use them. I would agree that whatever the outcome, the woman should be trained to his way and since this place has no verifiable way to get to them or learn about them, then I would still say this is probably a scam.
Well, I'll be darned. Live and learn. Thanks for letting us know.
The small-breasted ones want larger breasts. The large-breasted ones want smaller ones. The straight-haired ones curl their hair, and the curly-haired ones straighten theirs...
Quit fretting. We men love you."