I Just read your source and it is anything but valid The website it comes from is there just to sell books made up by the site itself It is as if I wrote a book proving that  toed frogs flew over Jesus head and then made up a website and asked Did the First Council of Nicaea suppress all of the verses in the Bible that spoke of these  toed angelic frogs now buy my book No the early church never believed in reincarnation The Writer of Hebrews had to be written before  AD because Clement of Rome quotes from it  more likely  ADwrote in Hebrews  Just as people are destined to die once and after that to face judgment So  years before First Council of Nicaea the church as well as the Jews the preceded them never believed in reincarnation