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Interestingly at some point the Emperor will confess to the Primarchs, or at least some of the Primarchs, about Chaos. Guilliman also thought the Emperor intentionally scattered his sons as part of an unfallible plan, so it seems he does have a little bit of Lorgarism in him just without the faith.
Given the Emperor told us to keep it a secret, this will probably be after Horus betrayal and obviously before the battle of Terra.
Made me look back and read that old thread. What does TalOS think of the scattering? I'd like to imagine he's read the machine spirit of his pod a hundred times over by now to realize that this was absolutely a mistake and was not supposed to happen. Also, the Mollusk is scary no sane man like the Emperor would willingly risk his sons to that!