The simple answer, notice, is that I have not had time to complete all the work I wished to complete on the subject, compounded by the fact that the goalposts are being moved by US Immigration faster than I can keep up with!
You may be aware of the fact that I haven't been active on the forums over the last couple of months. I won't bore you with the details, but it's not for lack of interest on my part. Unfortunately the demands of my family and my employer take precedence over the demands of Pprune, or any individual on Pprune - including you.
As you know, Richard Gentil's post on US Visas remained on Private Flying even after it had been removed from Wannabes, and there have been many posts over the last few months detailing the changes to US immigration policy as it affects those on flying courses, so I hardly think you've been deprived of the relevant information. In any case, haven't you done all the US courses you need to do?
To those who genuinely (unlike notice) need accurate information on the appropriate visa for your period of training in the USA, you are strongly advised to contact the US Embassy in your country of nationality. Remember, whatever information is posted on Pprune can never be taken as Gospel on the subject; you must talk to the US authorities.
Scroggs