Board Thread:Warhammer 40k General Discussion/@comment-25618639-20150807010020

In the book Vengeful Spirit, page 331, it says the emperor got his poweres because he traveled to the planet Molech and entered a warp gate to speak with the Chaos Gods. It then says that the emperor made a deal with the Chaos gods, which gave him  psychic powers that his has today. Is this true info true or is the Rogue Trader info still right?  