Yeah, they're explicitly using
Infinite Frontier Superman, which means Pre-Crisis, Post-Crisis (Pre-Flashpoint), New 52 (Post-Flashpoint), and Rebirth all combined into one character/Canon Composite of all eras of
normal/main Superman.
Edit: It also wouldn't really matter if they did pick and choose feats, because Supermen of different eras have thrown hands with each other, making them for all intents and purposes pretty much relative and able to be cross scaled. Golden Age Superman and SIlver Age (as in different periods of Pre-Crisis) duked it out and were relative, then later a stronger Golden Age Superman fought Post Crisis Clark and they were relative too. I also remember New 52 fought Rebirth and they were even, and Rebirth was Pre-52 + New 52 continuity wise. So they're all roughly comparable. And Infinite Frontier is canonically all of those canons put together, meaning regardless he gets at least ONE instance of where he scales to wacky comic BS.