There is no true and false sufism. The only thing is that Sufis have gradually become clever( And of-course they don't want to become Mansoor Hallaj) and they are only going to reveal the stuff you mentioned to you when they feel that you can digest it. At the beginning , they are to keep it low like they will tell you "Tasawwuf is all about Tazkyaa" , "Tasawwuf is just an apparatus which helps one reach the status of Ehsan" etc etc