Originally posted by qwertyuiop1998The first time Krypton was portrayed as exploding was in Action Comics #1. Why wouldn't you cite it?
Except the citations the timeline made are pre-crisis comics? Including the instances you mentioned, which are MMH's appearance on Earth and Krypton explodes
They are both specifically attributed to
1)Detective Comics 225(1955, https://dc.fandom.com/wiki/Detective_Comics_Vol_1_225)
2) Action Comics 1(1938)
https://ibb.co/GQsJHCsp
But the publishing date of an event's portrayal does not control when it occurs in the DC timeline. Otherwise, that'd be the first thing in the timeline. Which it clearly isn't. You're conflating publishing date with canon historicity.
Waid blew right by WW2 without mentioning Superman's pre-Crisis adventures back then at all. Even specified the time-travelling Hippolyta fighting back then.