I mean he certainly looks like a Superman
Also apparently tested Alexander and Bill Skarsgard for Lex Luthor, and perhaps Nicholas Hoult (who originally auditioned for Luthor, become a top 3 candidate for Superman, but may have also still been in the running for Luthor).
After Succession I really wouldn't mind Alexander Skarsgard as Luthor, he really can play that charming, chilling, a little weird in the public eye, narcissistic, ultimately sociopathic billionaire really well