As a general rule regardless of who the breeder is or how famous he is if I do not get an answer in a timely manner after 2 emails I move on.
I understand being busy however 4 months without answer
There are plenty of great breeders out there with amazing animals and amazing customer service that will be more than happy to answer your questions.
If you still want an animal from BHB than try the phone maybe you will be more lucky.