It is nonsense in the fact that the Bible has simply not been translated by anybody (except him, apparently) in such a way as to overturn the whole meaning accepted for millennia about the nature of God.
What does “worked at the Vatican” mean? in what capacity? You must admit your question smacks of conspiracy theory based on what sounds like science fiction. A fundamental hurdle in translating the Hebrew of the OT is that there is no Hebrew dictionary. It is challenging to translate a language that has no upper and lower case, no spaces between words, no punctuation, etc. The Jewish scholars translated the Hebrew scriptures into Greek, which offers the best snapshot of what the Hebrew text means. Sure I know neither ancient language, but the sense of it has not come down to us as referring to aliens or referring to the other sensational new meanings offered.
Further, the New Testament makes no such claims nor refers to the sensational things proposed by this author.