Lex Luthor is living in our world, posing as a shadowy oligarch. Superman hasn't gotten here yet.
Though, maybe it's because the current iteration of Superman is weak sauce. The real Superman is elsewhere, fragmented. The Jurgens/Tomasi Rebirth guy is an attempt to defeat Superman and trap him in his own narrative. A metaphysical Black Mercy, for the Post-Crisis Superman who has been comatose since 1998. His dreams are contradictory in nature, which explains the inconsistencies. Luthor attempting to trap Superman in a hypersigil he can not escape from.
Things might start getting weirder in our reality. We're about to experience interdimensional warfare, fellas.