I think it is perfectly understandable that some people wish to keep a few secrets to themselves if they are breeding reptiles on a commercial or semi commercial basis. Some people have invested a lot of money, time and heartache into their reptiles so why would they give away all their breeding secrets to someone who has just come along. It would be nice if people shared info but I can understand why many do not wish to. I have found most breeders to be very helpful once they know you are genuine.
When I was breeding 50000tropical fish/year you would be surprised at the number of people who just want to come around to find out how to do it because they think you are getting rich so they can as well. You would have a better chance of getting rich with a lotto ticket (one in 3.8 million)
I don't know the person selling but they have bred and raised offspring that look healthy so they must know something.