The Routh Supes' rumor originated from Ryan Unicomb: https://www.instagram.com/p/B7cS4uXl9Jh/
"I have heard this twice now in too close a fashion for it to be a false lead, so I’m willing to put this out there. Due to an overwhelmingly positive response to his brief appearance in the 2019/20 CRISIS ON INFINITE EARTHS crossover event; actor Brandon Routh, Producer Greg Berlanti & a small collection of creatives originally involved in 2006’s “Superman Returns” have met with WarnerBros over the last few days to discuss the potential of a Post Crisis SUPERMAN limited series for The CW or the more likely option, HBOmax. The outing would see Routh return as the titular character and reunite him with “established characters in Superman lore”. This would be developed alongside the recently announced straight to series SUPERMAN & LOIS, also Produced by Greg Berlanti."
It would be ridiculous if Superman Returns gets a sort of sequel but Man of Steel doesn't. 😂