Routh is likely playing an otherwise new take on Supes based on KC Superman that isn't the 'Returns/Reeves version of the character. It's probably because of that detail that they didn't go that way considering the implications that could follow (if 'Returns universe is meta-canon, why not the scores of other DC movie universes?).
It appears the only returning characters retaining their own canon are on the TV show level, like Smallville and Birds of Prey of all things. They probably feel silly for wasting that "Save Me" theme swerve from last year's crossover.
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